A 30 year dream becomes reality
Stimulated by seeing the layout by Robin Whittle and the Glevum group at Scalefour North, I came home and dusted off the papers, maps, plans and photos built up over 30 years for the time when '75A' would come to life... that time, I have decided, has come!
I was impressed by Chris' (??) baseboards. He took the time and trouble to describe to me the construction of the baseboards which he produced. He uses 6mm beech ply in two laminated layers to construct the edges of the board, the inner layer being recessed to take a single 6mm sheet for the trackbed. The resulting box is strengthened by intermediate members but no diagonals. Up to now I have used a geodesic plan based on 9mm plywood, but I have decided to give Chris' method a go for 75A.
OK, so what's the plot? Well, Templot, actually. There's no way I could achieve the required diagram without it. Yes, it's a devil of a learning curve and I still only know about 1% of it, but for anything approaching realism, I can't imagine a simpler and more reliable way of planning such a complex track layout. I still think that Martin Wynne studied at Hogwarts!
Unfortunately, copyright laws prevent me from showing the Ordnance Survey map (which I bought!!) at 1:2500 which shows the 1956 track plan in enough detail for effective use. I used it in Templot as a background image and am midway through version 3.0. Why version 3? Because I'm still learning! Templot is very flexible and you can go back and revise, correct and amend and that's what I've done. The templates are still far from perfect but they will be refined over time. I have attached the current track plan from Templot to show the extent of the layout.
The baseboards (as currently envisaged) are shown in red outline. I say "currently envisaged" as these are very irregular shaped boards and joining them together is an important consideration for e.g. exhibitions. The location of track, point motors etc will have a dependency that results in the final shape. Not being a carpenter my results won't be nearly as neat as Chris'. As with Barrow Road, I hope to have the first two boards in place very soon and these (the East sidings) can provide some running without the other boards being finished.
I have plenty of photos of 75A as it was. The problem is that I only have one of my own (I don't own the copyright for the others) and it isn't very good, having been taken in the snows of January 1963.
However, to conclude this introductory, I attach photos of the first board top cut out from 6mm Far Eastern ply this weekend. The templates were only stuck on temporarily to determine the shape of the board and will be soaked off shortly. Using the templates to map out the shape of the board is better, I find, that relying on the background shapes that you can add to Templot. (btw I don't have any commercial connection to 85A!)
Wiring? Not on 75A. It is being built not only as my own layout but also to demonstrate Acc+Ess Protocab in action. Visitors will be able to control locos from their own handsets at exhibitions so we hopefully won't be short of 'demonstrators'! Referring to my photo and the plot, the viewing position will be from the curved edge on the south west side of the plan. This is actually a very high roadway (Howard Place) from where the photo was taken looking down on the site. Brighton station was constructed on a shelf cut into the chalk hill and there is a sheer cliff face between the road and the railway. in 4mm this is around 350mm at its highest point so dictates the layout datum height for reasonable viewing. On the other hand, I might omit the cliff altogether! Viewing from the other (i.e. north east) side is less attractive as I plan to build the main line at some time in the future.
You can see from the plan that the whole site as modelled is not that huge, and two fiddle yards (one disappearing under a bridge to the left of the layout and the other disappearing under the station canopy ) the overall length is around 30 feet and 6 feet at maximum width. Hopefully this will be an Exhibition Manager's delight to fill that awkward corner!
When will it be finished, ready for display? There are very few buildings, except for the engine shed itself and the iconic water tower and three softening tanks that seem to appear in every photo ever taken of 75A! With no wiring and thus no need to insulate any of the points and crossings, a lot of time will be saved compared to my experiences with dc and DCC. There is a considerable quantity of track and some fiendish pointwork (scissors, 3 ways and several irregular slips). I'm planning to be ready to lay the underlay at around the time we have the induction charging mats ready for Acc+Ess Protocab, so that these will be incorporated in the layout, preferably within the underlay itself.
I'll keep the forum updated on progress and welcome any comments, criticisms and suggestions!
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