TrainTronics 107 4 Aspect Colour Light Signal Yellow/Green/Yellow/Red OO
A working scale replica of the BR style 4-aspect colour light stop signal, used to control trains on busy routes. Switchable between green, two-yellow, yellow and red aspects a 12-volt DC power supply is required.
The 4 aspect signal displays an extra message to the driver. The two-yellow indication is a caution that the next signal is showing one yellow aspect, and the signal after that shows stop. This extra warning siatance permits signals to be placed closer together on busy routes, allowing more trains to be run safely.