The red arms are often seen before signals with yellow arms, which signify 'distant' or 'caution', as per semaphore signals. Tech Specs.
Hornby TT:120 Home Signal TT8045
TT120 Hornby TT8045 TT Gauge Home Signal - Extra Track Pieces for Model Railway Sets, Toy Train Track Pieces, Model TT Signal Piece - Hobbies for Men - Scale 1:120
Hornby tt TT9019 Hornby Tt Double Engine Shed Red Brick TT:120 Scale Gauge
