Bridge over……….

A few(?) years ago, when I first brought notice of Princes St to the then membership of ModellersUnited and others, the original plan for the Morrison St bridge was to use the Wills components for the side. This worked fine for the side nearest the station.

Thoughts about bridge sides never entered consideration when deciding to extend the layout to the Grove St bridge. It was only after buying another pack of the Wills components and examine photos that reality hit. The bridge sides at Grove Street, Gardner’s Crescent Main lines, and goods lines are all different. And none matched the side facing the station.

Initial thoughts were to bluff it. Use the same style of sides on both sides for the main lines on Morrison St. This looked not too bad. It resembled reality if you had a vivid imagination and kept your eyes closed! If you knew what the bridge side was really like….well. Not too many photos exist. However…….

The Grove Street bridge side, to the non-engineering oriented, ie me, is best described as a slab with rivets. To modify the Wills components would require significant cutting, with an excessive number of butt joints the I wasn’t confident I could lose. Knowing the height and length of the side, the decision was made to scratch build and use Archers Rivets to represent the riveting required. To date the rivets have still to be added, but the bridge side so far creates the correct illusion.

The Gardners Crescent bridges are more “interesting“. The sides over the main and goods lines are completely different. The goods lines portion appears to be a welded slab. The passenger lines side is a combination of weld and riveted. Again, Sod’s law makes the Wills components inappropriate for an accurate representation. To further complicate things, the pavement side of one side of the bridge over the passenger lines differs from the outside face. A good view of reality can be obtained from Google Earth, or the Streetview apps, but I’d recommend you move a distance away from the bridge to minimise the distortion caused by looking up from close range. Having initially accepted a loose ‘interpretation’ using Wills components, which was noticeable short for length required, a more accurate interpretation is underway, based solely on photos. Initial progress looks promising. The ‘Niggle’had increased to ‘replace’

Initial attempts using Wills components to replicate station side of bridge. It was uncomfortably tight for length, and unfortunately, looks nothing like the images available on Streetview or discernible from 1960s photos There’s nothing wrong with the Wills product, just inadequate suitability assessment and lack of planning on my part!

The side lighting exaggerates the relief. The bottom section contains the rivets, and is still to be attempted. But it does create a better impression. Once the cunning plan had been devised, it was surprisingly easy to execute successfully.

Other work since the last posting includes more work on the buildings on the Morrison St/Grove St boards. Initial testing to check proportions with adjacent buildings looks good. For some reason, I find that what I consider plain, everyday buildings as (un)interesting to photograph as wiring. No doubt others will disagree!

Looking across Gardners Crescent, over Morrison St. Original layout building with black/white side to be replaced with more accurate version including frontage to Morrison St

Looking down Morrison St towards Haymarket. The building on the right hand side of te road is too high in proportion to it’s colleagues.

Looking west down trackbed with Grove St bridge in distance. Must clean trackbed! The original buildings on right hand side are out of proportion ( too high) with the rest and are scheduled to be replaced.

The factory next to Grove St bridge needs to be raised @ 5mm, and the lean-to nearest the tenement widened a bit. Aren’t you glad we don’t take all the clutter from the models home to exhibitions?

Pavements in place for Gardners Crescent (left) and Morrison St. At 39’ between kerbstones, Gardners Crescent looks wide, but Google Earth measures out at 41’. Interestingly, or maybe spookily, for something laid out by eye to fit the baseboards, the angle and distance between building fronts at the end of the existing pavements is spot on for the real location.

The three bridges have become a welcome diversion. Although unfinished, the basic shapes have been easily defined. The detailing has required a degree of lateral thinking and a couple of trials to determine what works best for me. They have so far delivered a quick sense of achievement and motivation at a time when other ongoing work has longer completion timescales.

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That’ll do nicely….

Almost ironically, after the initial lockdowns had finished for some time, my workload focus came to an unplanned stop due to a shortage. Of wood! Three subsequent visits to my local DIY “Superstore” indicate the situation isn’t getting significantly better, and although some materials have been obtained on most visits, a level of compromise has been necessary to complete baseboards and maintain progress.

The second of the two boards that cover the section between Morrison Street and Grove Street bridges has been built and the scenics commenced . Preparatory work on the buildings and structures for these two boards has been completed. Like the main boards, a degree of compromise has been required, relating here to managing the six road exit from the scenic portion for connection to a possible mini fiddleyard will in the garage. This is in keeping with my intention that the model I’m building is an interpretation that captures the character of the location. That is more important than a scale model that doesn’t.

Looking west from Morrison St towards Grove St. Gardners Crescent is in the foreground. Additional support in the form of rectangular box section was required where the cross girders would have been to prevent the bridge insert bending over the running lines when attempting to remove the bridge

The old paint? factory on Grove St positioned to check ground levels and overall proportion for location. Point-work locations for the goods yard point-work between the two bridges. In the real world, the factory has been replaced by a hotel.

The additional strengthening to prevent bending when removing the bridge, before the wood supports for the retaining wall were cut to size.

Far too tidy to be my work area! A good friend volunteered to make the safety railings for the top of the retaining wall between goods and passenger sides of the station and approaches. Complete with the different styles of post used. This is an early view of progress while the best construction methods were being developed

Take care and stay safe

Nearly round the bend

As indicated previously, I’ve recently taken an (enforced) break from the electrical side of things. Taking advantage of “summer”, and some temporary free floor space resulting in a partial tidy of the garage, work has commenced on the first of two scenic extension boards. This carries most of the Morrison St / Gardner’s Crescent bridge. Not wanting an obvious baseboard joint down the length of the road, a piece of 9mm ply was cut to shape, before being abandoned as slightly heavy. It has since been replaced with 3mm styrene, which hopefully will have sufficient bracing and support to prevent it flexing. If not, it’s back to the ply! It’s still early days, but it does have promise as a stand alone photo diorama for stock, and captures the atmosphere of the location

Must remember to hover before taking photos! The building facing Morrison St gives an indication of the view blocker between the two parts of tha layout. The Wills girder bridge is tighter for span length than I though, but possibly ok still. Track omitted from the remaining two goods lines until it can be properly aligned on the next board.

When the ‘new’ Prince Street Station was built, the bridge was extended, and the main lines lowered approx 6ft. The arched bridges over what would become the goods lines, where replaced by girders for roughly the first 25ft of their length. On the model, the main lines are 18mm lower, and the gradient starts just outside the bridge. At this stage, it most be admitted that trying to properly align the goods yard roads without having the second board to Grove St bridge in place, isn’t the easiest thing to do, and does increase the priority to get the timber to get on with that too. Owing to baseboard width constraints, the goods road nearest the edge of the board doesn’t progress far under the bridge, although this is disguised quite well by the angles of the bridge and track.

Photos of the prototype can be viewed at the following links. The end of the baseboard is roughly where the signal is.

https://www.railscot.co.uk/img/29/568/

https://www.railscot.co.uk/img/35/477/

Take care and stay safe.

 

 

You can’t always get what you want….

Fifty-two years ago Jagger and Richards probably had no idea their song title would ever appear in a model railway blog. However, their words are very valid.

Forty years ago, I built, from an article in one of the electronics magazines, what was in its day, a state of the art dual power supply that would be used for electronics projects and my model railways. +12V and -12V each delivering output up to 2A, short circuit protected. My interest in electronics waned, but the PSU has faithfully served all my model railways without fault.

Until Monday.

It was the aroma of hot transformer that was the giveaway, confirmed by one of the supply voltage LED on the power box being out. A quick unplugging from the mains and placing the unit at the garage door made everything safe.
Checking next day, scorch marks around the Bridge Recifier, among with a distorted casing suggested it had failed. Testing the 5A rated component with a multimeter conformed it. The failure had occurred before the protection circuitry, rendering it useless. Unfortunately, there was no protection for the transformer output, hence the smell and damage.

Time to find a replacement.

Over the years, as rechargeable or cordless devices have become more efficient and affordable, the number of ac- ac chargers has diminished incredibly. Two or three years ago a search on certain ‘ convenience’ websites identified plenty. Today you can count them on one hand, in some cases, one finger! To replace my split Power Supply Unit, I now need two Separate units, one to become the +ve side, the other the -ve side. To combine them, I’m recommended to follow certain criteria, which reduces the available choice further. The silver lining, is that it will still be cheaper than a replacement build it yourself job. The tradeoff  I have to accept, is that the replacement will be able to deliver 150% more current than its predecessor, more than the wiring in Princes St is rated for, although, fingers crossed, the current protection incorporated into the devices will safeguard that.

I, like many modellers, tend to be a recycler. As such, the controller feeds are from one PSU. Point motors another. Signals/servos a third. LED in buildings or control panel a fourth, and so on. Each with its own voltage and current rating. Possibly each with it’s own style of connector. While we tend to accept that most white goods have an expected working life, and that our parents/ grandparents washing machine/fridge/TV, etc that lasted 40 years don’t  exist any more, it shouldn’t really come as a surprise when something hobby related fails after ten or more years. Yet we don’t plan for it, and it does! Incidentally, the current estimated life of any electronic component without any moving parts is 50 years max.

While a power failure is a a pain for a domestic layout, if it one that is to be exhibited, it is much worse. It can, and does happen immediately before or during exhibitions.
It’s got me wondering, for a layout planned to be exhibited, is the best approach to standardise on a specific rated charger/psu, then multiply as required for the separate systems, then buy one or two extra as contingency for any failures?

Think about it. All supplies delivering the same voltage and max, current, through identical connectors, making it more idiot proof. Any PSU connected into any socket and everything works perfectly.

The worse case by not standardising, in the event of a failure, when you really, really need the fix  “You can’t always get what you want”

Take care and stay safe.

 

 

 

 

Believe in yourself…

“Believe in yourself. You are braver than you think, more talented than you know, and capable of more than you imagine.”.   Roy T. Bennett – The Light in the Heart.

I don’t think there was a day at any exhibition where I’ve been either demonstrating or exhibiting when I’ve not overheard the phrase “I could never do that”, or some variation of same. When possible, getting the person to sit down, showing them the appropriate tool that I use, giving them a scrap of material and talking them through the process and getting them to try for themselves, and allowing them to keep their attempt demonstrates how simple some of our techniques really are, and hopefully provides the initial encouragement to continue. How quickly it maybe possible to return to that kind of demonstrating when exhibitions restart is anyone’s guess, but I suspect as it’s the one facet of exhibiting that doesn’t easily coexist with social distancing, it’s going to be some time yet.

Until then, try to remember Roy T. Bennett’s words.

On Princes Street, work continues with the wiring. The relay boards for the signal servos have been installed onto the station throat board, together with their 12v supply and associated wiring. One point motor needed to be moved to a signals servo mounting. The wiring for the scissors crossing frogs has still to be connected back through the point motor switches.
On the more interesting side, in addition to the @180 carriage cleaning supports that were laminated, there were twelve larger supports. Obviously, the twelve were cleaned up first, and the rest are being worked on. I find that a maximum of 20 at a time is about my limit before I need a couple of hours doing something else. Like scribing plasticard, setting an achievable objective for each work session is more important than aiming to finish in as short a time as possible.

A while ago research ended my intention to use the “traditional” long manual lever for the carriage sidings points. Back in my teens, I used some GEM point levers for Farish points on an N gauge layout. It was something vaguely similar to these, but without the robustness functioning levers required. The Caledonian Railway Association indicated these were similar in design, so sufficient were purchased.

Small, fiddly, and benefiting on deciding the best assembly sequence before you start, they build into a very nice model, despite the cruel photography of my first attempt.

 

Take care and stay safe.

There’s always one. Or two. Or three…

I don’t know anybody in the hobby who hasn’t had an occasion when things didn’t go quite as expected. Yes, when this happens it can be infuriating, sometimes possibly temporarily soul destroying. However, we tend to become inventive to find a solution that works for us. Sometimes these can be incredibly simply and obvious we later wonder why it took so long to address.

The big board has the most point motors.  Going against conventional wisdom, the baseboard was built without any strengthening cross-members. The idea being they would be added later, after the point motors and wiring were installed to avoid the situation of either having a tiebar above a cross-member, or a crossmember where a point motor needed to go. This has, so far, been remarkably successful. The ply used for the frames and surface hasn’t warped.

There were a couple of tiebars that got a wee bit close though

A bit of lateral thinking, and the light bulb goes on! A minor change to the operating bar, relocating the tiebar wire to the end, instead of between the two guides, solves the problem

 

One material I’ve very rarely seen modelled well is concrete. It has incredibly subtle original colouring and weathering which is far, far too easy to loose at the painting stage. It’s something I need to get right for the platform coping stones and the carriage cleaning platforms and support.

Some time ago, I bought one of the dark grey acrylic washes used by military  modellers. The idea looks quite promising, and needs more experimenting and then to get a better colour match

You do have to make sure you apply the wash in one go, and don’t stop for a coffee. Otherwise you’ll be cleaning it off and starting again,  unless you want puddle outlines!

Take care and stay safe

 

That’ll teach me ( or maybe not….)

It doesn’t seem like nine months since my last update. A lot has changed in the world. Sadly, not always for the better. Hopefully, mankind will come out wiser.

Before Covid-19, the group where I’m a member were discussing  preparations to take the group layout to Model Rail Scotland. It came as a bit of a surprise when the usual van driver announce he was now too old to hire a van! The realisation dawned that nearly 50% of the group are 70+, 25% have health concerns that prevent them assisting in transporting a layout. My intended operating crew were getting old. After a long hard look at the layout, I revised my original intent of no deadline for completion, to having it advanced enough by early 2021 to decide if it will be exhibition ready for 2022. Assuming anybody wants it that is!

When last provided an update, everything on the layout seemed to be progressing nicely.

However, a couple of tiebar breakages at the operating hole has resulted in the decision to replace all of them with what should be a more robust design. This required a change to the mechanism below baseboard, which wasn’t always happy with the existing point motor-mechanism connection. The sub board assembly is my take on an article in MRJ. The new style tiebar ignores all the sound engineering Dave Franks incorporates in his, on which this is based. Added to this I grew frustrated with the time being used up trying to get a single point motor to work both points in a facing or trailing crossing 100% satisfactory. Ultimately deciding to use a pair of point motors for each crossing. I know other people have used a single motor and achieved the consistency I sought, but suspect they made those crossings the first thing to be connected up and proven, rather than trying a pseudo retro fit in a diminishing space.

Still to fit servo boards and servos.

While in lockdown, I’ve start work to replace the somewhat chunky carriage cleaning platforms that first appeared in Modellers United. Cut by the Silhouette cutter, and laminated from 4 layers of 15thou, more plastic arrived today to get the rest of the supports completed over the next 2-3 weeks.

Finally, thoughts have commenced on how to represent the inside of the roof. Actual work is limited until the curved trainshed wall is rebuild to the correct dimensions.

Take care and stay safe.

 

Lets say “Thank You” more often

It’s been a long time since my last post. Sadly, a terminal illness in the family and it’s inevitable outcome removed focus from the layout for a considerable time. It has made me aware of the number of modellers who unknowingly, to them, have been part of my modelling inspiration who are no longer with us, especially those we have lost over the last couple of years. Modellers that I now wish I had the opportunity to thank if I met them, for the positive effect they had on my modelling. Although I suspect many of us still feel quite young, our reflections  tell a different story, and the clock is ticking. For everybody.   So, next time you see a layout at an exhibition that inspires or educates you, or  you find particularly  enjoyable watching,  consider a “thank you”. It’ll make the exhibitors day.

In a previous blog I mentioned that Rapid sold spare microswitches as used on Fulgurex and Lemaco point motors. A visually similar design but with black moulding is used by PECO. Rapid have discontinued the product, but they are available in Europe from a company called TME, at a very attractive price. I’ve used them as a customer, and found order deliver times no worse than uk suppliers.

https://www.tme.eu/en/details/1010.0101/microswitches-snap-action/marquardt/

 

I was privileged to be invited to participate in the EMGS/S4 Skills day in Linlithgow a few months ago. A hugely enjoyable day from my perspective, and a good turnout of modellers to support the event, especially as a certain rugby match clashed with it. As per my reputation with certain people, my one table, quickly became three tables filled with the Silhouette cutter, a laptop and various buildings from Princes St. New buildings for the corner of Morrison St and Gardner’s Crescent, although still very basic, were identified quickly by a few people that walked past the real ones on a daily basis. The nature of the stonework resulted in the Silhouette being used to scribe the dressed stones. Having been impressed by the success of that, a small example of scribed brickwork in various courses was prepared. The potential of that  seemed to generate a fair bit of interest.

With the ability to do this, resisting the temptation to clad the signal box, SSEB workshops and gasworks hasn’t been easy. However, it has provided the basis for the best solution so far to the challenge of the trainshed walls. The originals turned out to be too high (proportions were wrong between rolling stock and screen end) and the palisades to support the roof cross members were too far apart. Work has commence on the new walls built to accurate dimensions. Scribed initially with the Silhouette, then hand scribed to increase the width and depth to get a better representation of the stonework. The challenge of a one piece or several components that will plug together to form the trainshed is still ongoing…. 

The process also has potential for modern day modellers who wish monobloc standing for cars. You can replicate any of the designs laid for drives/parking areas and scribe to that design using the correct scale sized blocks.

Slightly later than thought

Those who have followed from the days of Modellers United, may by now have noticed that my predictions for completing the wiring and have something move under power, are , well, lacking. Perhaps that’s why I’ve never won a lottery.

Happily, all the point motors in the station throat are now fully wired and working as required, feeding back to the panel for route indication. Work is progressing relatively quickly through the traction feeds. I find that working upside down under a baseboard, having a target of one feed per session is easily obtainable allowing for issues, there have been a few – computer extension cables frequently, and the time required to get back “topside” to check electrical continuity. I’ve also decided to replace the original thin and narrow  copperclad  tiebars with a variation of those used by Dave Franks on his Wharfside layout. The first two originals failed at the hole drilled through them within a couple of hours testing. Not a good omen!

LEDs and cameras, never a good mix. Panel indicating an arrival fron Down Main to platform 6, and an ecs movement from platform 3 to the carriage headshunt. The indicator under the signal gantry shows which carriage siding the manually operated points are set to. Replacing tiebars isn’t likely to delay full running, still have the rest of the layout to build first!

In one of the forums, there has been comment recently with unsatisfactory  experiences with certain pointmotors. On Princes St I use a combination of Fulgurex Lemaco and Colbalt IP. The Cobalts were purchased due to the non availability of the others, and do seem a bit slow compared to the others when they all use a stabilised 11.6V supply ( that’s the voltage that made the others run at what I consider a realistic speed) The Lemaco’s are the best part of 30 years old, and have never given a problem. The Fulgurex are up to 34 years old and have suffered only two failures – a diode and a stalled motor that wasn’t noticed for twenty or so minutes, by which time the motor case was too hot to comfortably touch. After this the motor always needed help to start running in both directions, taking about a minute to get to normal speed with no load. It then would be fine that night. A replacement motor resolved that.

I’ve also had a couple of additional auxiliary switches need attention. These were bought at Exhibitions, and are not moulded in the same colour as the original switches. The holes for the mounting screws didn’t clear the screws. On one switch the outer contacts were misaligned so that it didn’t act as a changeover switch. On the other the common wiper was free to move in the moulding. I did feel that the exhibition bought switches required a greater force to get them to throw.  Recently I discovered and purchase more auxiliary switches from Rapid Electronics (https://www.rapidonline.com/marquardt-1010-0101-momentary-microswitch-2a-spdt-main-actuator-solder-0-6n-59-4077) these appear as good as the originals, and will be used as required.

 

To good to be true?

Some time/years ago, I misplaced my 1” drill used to  create the recess for baseboard joining dowels.

Recently, while browsing a large internet retailer’s website, in amongst the plethora of metric sized drills, I found a set of three flat wood drill bits in 1/2”, 3/4” and 1” sizes according to the description. All for the princely sum of £2.53 including postage.The size could be read on the drills, so the order was placed. A couple of days later the order arrived with the packaging proclaiming it included 1/2” (13mm), 3/4” (19mm) and 1” (25mm) drill bits. Not quite so impressed!

Checking with a micrometer didn’t help much either

1/2”.            0.545”.         13.87mm

3/4”.            0.774”.         19.67mm

1”.               0.991”.          25.18mm

In use, the 1” bit produces a recess that is a firm fit for the dowels, with no slop whatsoever.  Impressed again. Whether an 85p drill bit is up to making the 12 recesses required remains to be seen.