Colour Light Signal Controllers
Two in Line Signals, 4 Aspect plus 3 Aspect (Part Number 020-431)
This Module Controls Two Signals. 
The first signal (A) is Four aspect and the second signal (B) is Three aspect.
Either Two or Three of the Detector Inputs can be used so that, if space permits, the operator 
can ensure that the trains have passed a safe distance ahead. 
Detector Two can be omitted if desired. 
Detector 3 starts a timer so the signals sequence correctly. 
An MRE Output Bus sends information to the next module in the chain. 
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