I have never been entirely happy with the control of points and signals on Kelvinbank. Three way switches allow a signal to be set to on, off or auto. Switches set the points, in auto mode they also control the signals via short timers. It is vaguely interlocked, but not perfectly. All workable but somehow not in keeping with the period feel of things.

So. Lanarkshire and Dumbartonshire section of the CR during the Edwardian era. Built in the 1890s. Boxes would have a Stevens & Sons frame. Like this one;

Some research on the model frames available showed that none were really what I was after. I only need a frame of nine levers to work Kelvinbank the way I want. The very good ones are expensive and none have that Stevens & Sons geometry, with a lever about 4 “ long. A long lever pulled forward from the vertical rather than an over centre arc.  Hmm, diy time

I have never scratchbuilt a lever frame. Starting with the above sketch it seemed like a good idea to have a mess about with a styrene mockup. Here is the third attempt.

I think that is what I am after. The stop block is sprung, gravity doesn’t quite scale. I bought some v4 roller microswitches off some lot called temu, 30 for 5 quid and they seem perfectly ok.

Bear in mind that I am not trying to make a scale model of the frame, rather a practical working frame in the style of Stevens & Sons. The lever spacing has to be overscale to avoid getting my fingers stuck.

Next stage, cutting nine levers from 2mm sheet brass.