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It seems to me it would be fairly cheap to fit a micro switch and lock in the gates to show the signaler if the gates were open or closed , no use on a 100+ line like Ufton but for the chuggers on Sudbury max speed 45 I think the signal box could send an emergency signal to the driver if the gates were not locked,, there could be a refuge at the side for anyone needing to abondon a vehicle in emergency,,with a panic button.
I dont think that would be too expencive in railway cost terms
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