Worst case is a repaint if you can't find a model of the actual one. The MTH Mars light is unbelievable in brightness. The Atlas does a decent job and the newer Lionel units where they have with a "working" light if you need a donor.
Bobby, do you know of a Lionel or mth engine with a mars light? I’ve been a bit frustrated with Lionel putting in their specs Mars light only to discover there isn’t one. Some of their 2.0 engines list this feature but when I ask someone with the actual loco it isn’t there.