OK the Atlas engines are nicely detailed I have both MTH and Atlas, yes nice detail on the Atlas. I will ask around our next train club members and see if anyone is willing to sell a green caboose as some have been for sale at club meetings in the past.
My 3 rail RS3 from MTH runs and pulls well looks OK. The 2 rail Atlas RS3 I modified cab paint to PGE green instead of BCR. Yes the Atlas has great detail but MTH works better and has the sound Atlas for my 2 rail is DC.