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Railway Magazine April 2016

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muttley01 | 10:02 Tue 12th Apr 2016 | Crosswords
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12 across: Device on a signal post that prevents a signal being cleared until both signalmen controlling it have 'pulled off' 4 Letters: _L_T
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Slot, slotting
A "slot", or "slotting", is an arrangement whereby two signalmen can control a signal independently (neither's lever affects the other), with the logic resolved at the signal itself.

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Railway Magazine April 2016

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