multiple-aspect en · ADJ
Meanings
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(not-comparable) Designating a colour-light railway signal which displays at least three aspects.
The new signalling controls 40 track miles; 31 multiple-aspect signals are operated by the new control panels and a further 31 signals are automatic.
1962 October, “Talking of Trains: New signalbox at Twyford”, in Modern Railways, page 227: