DS9 - Multi 3 Aspect Signal
Modern railways have multi aspect signals where a single lens (DS9) can display red,yellow or green and a 4 aspect dual lens version (DS10) which can also display double yellows:
Train-Tech offers both types with the DCC decoder pre-fitted and like all other DCC signals is easy to control using a DCC address of your choice.
DS9 - Multi 3 aspect signal
DS9L - as above but fitted with Left feather indicator
DS9R - as above but fitted with Right feather indicator
DS9T - as above but fitted with Theatre indicator