The manual says all lights operate in conventional.
I went looking for an engine with the MARS light because when I was a kid in Chicago, the C&NW engines had MARS lights. I really like this MTH light. This engine also has the horn that the C&NW engines had. I assume the C&NW commuter engines were E8s....not sure.
Have seen images of both C&NW E units and C&NW F units in commuter service. Google will pop a lot of them.