B&O style Color Position Light (CPL).
This version is a modified style 02, with stop, medium approach, and
medium clear only, left diverging...used for the end of a passing siding.
Also, this is the same as CPL_02b, except it goes on the left hand side (LHS)
of the track. Note: in order to get it appear to work correctly everytime,
I made approach look like medium approach and clear look like medium clear.