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The electrical connections are the same as on my other cassettes. I didn't show how I took the wires from the terminals to the rails, so this is how I did them.
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Four pre-grouping wagons (plus brake) are likely to make the longest train on the railway.
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I have a functioning fiddle yard. Two "short" cassettes (far left) match up with one "medium".
I am a bit surprised how flat the modified cassette sits on its baseboard. If warping occurs, I can think about fixing some aluminium strips along the sides.

The fiddle yard has turned out to be a bit cramped (photo in October 2024) and I am making a new one to use the same cassettes.

The new fiddle yard is a reversible design, for use at home and at a show. The layout connects to either end, so the open side of the fiddle yard can be at the front of the layout or at the back.
There will be a display board for exhibitions, a shelf to hold cassettes and stowage for r/c handsets.

The basis of this is a kit from Grainge and Hodder. I have dispensed with the cross-braces supplied in the kit because I don't think they will achieve anything useful in this application. I have put in the diagonal brace instead, to stop the long sides moving relative to each other.

The brace going under the baseboard had to go in through a hole in one side. This is now blanked off.

I have taken photos to show parts of the structure before I add the display board. With triangulation in two planes the whole thing is very stiff and shows no desire to settle on a skew.

The short lengths of oak are a shelf support and something to hold a lighting strip.

A mock up before I add the display board and fix the shelf, with the unmodified Corgi road locomotive for continuity.
I want to think I could eventually add further stub tracks so I can use this creation for other track gauges. Especially my H0 and H0e models because I have no workable layout for these at the moment.