I have an MTH railking F3 from the Chessie construction set, followed by an A dummy and 11 HEAVY post war cars. 4 milk cars, 4 dumping and loaded coal cars, (the coal cars were loaded so heavy, that they would not dump using a 1033 for power the first attempt - I had to wire up a Z750 to the RCS track!) 2 loaded dumping log cars and two other cars. Engine pulls them around an 7' x 17' modified oval (031 and 042 curves and switches) with NO problem. Better yet, it will back them all the way around, as a test I did that. I keep waiting for a derailment....but not happened yet.
Transformer is a Z1000 through the TIU with 4 track powered switches and a couple of lock-ons.
I am guessing your passenger cars should be no problem. Same engine pulls 4 Railking Amtrak cars easily.
Go for it, Greg