2 x 3 Aspect globe signal, The Signal on the left is a Route Indicator below, (Signal 172) This Type of signal is control by Train Control

2 x 3 Aspect globe signal, The Signal on the left is a Route Indicator below, if the left signal is showing either a yellow or a green the driver is either branching off to the left or entering a loop/siding (Signal 172) This Type of signal is control by Train Control