Out of all the passenger stock you shown, and aside from the Combine, I like this one a lot!
It's a fine passenger coach. The only thing I'd complain about is the, historically speaking, inaccurate color scheme for these cars.
They're lettered for the "Union Pacific Railroad" (UPRR) and thus the cars should be colored a deep green color and gold lettering and livery and the roofs painted black.

Again, that's just me. They are all fine looking pieces of railroad equipment and prime for some super-detailing!! XD