Is there by any chance similar information in the old BR standards for the transition the other way - MAS to semaphore?
One question on the diagram - what exactly is the distant symbol under the home on 1(b) meant to signify?
to start a colour light area either with a two aspect (green/yellow) colour light acting rather like a distant signal (the next signal being a 3- or 4-aspect colour light),
or (if signal spacing is critical) to use a 3-aspect colour light as the starter at the end of the semaphore signalled block. In this case, once cleared (by the semaphore block's signalbox), the colour light would be backlocked by clearing the block's distant and the colour light signal's display of green or yellow would depend on the aspect of the 3- or 4-aspect signal in advance.
to finish a colour light area with a three aspect signal with the green/yellow aspect worked as the distant signal of the semaphore signalled block in advance
grovenor-2685 wrote:Indeed those are possible situations, but the question concerned transition from semaphore to MAS where 2 aspect red/greens are not the norm.
The context for this is the same as my question on distant signal locking - wanting to simulate the operation of signalling using a computer based interlocking, controlled with an IECC style computer screen.
I rather suspect, beast, that your memory of the early 1960s is not quite the same as mine, I was working in the LM region signalling modernisation team, where were you?
These days things are different and I will happily concede you have a deeper knowledge of the current scene.
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