Abbreviated term for SPAD IndicatorA Colour Light Signal head that displays flashing Red over steady Red over flashing Red in the event of an associated Signal being passed at danger without auth... More.
The site for Miniature and model signalling!
Abbreviated term for SPAD IndicatorA Colour Light Signal head that displays flashing Red over steady Red over flashing Red in the event of an associated Signal being passed at danger without auth... More.