I don't remember if they have a Mars light.
I have the ABA PA's with the powered B. They are too light, IMO, and not great pullers.
I have promised myself to add weights to the chassis. Up a 2.2% grade
with my seven GGD Super Chief cars, both powered units shimmy under the strain.
A third unit (I will not add one) or weights are needed to avoid "doing the shimmy."
Another option is I rev it up at the beginning of the grade to gather enough ooooomph.
They are gorgeous, but don't have gravitas. I could say the same for a former girl friend.
Scrappy