The market is "FLOODED" with MTH ABS 18" passenger cars in every road in both fluted or smooth sided variations.
Joe
Too bad the colors don't match the engines made by other manufacturers. 
Actually some do. I run MTH smooth sided N&W cars with the Lionel #611 J.
Its a dead on perfect match.
Besides, other then the Daylight and Dreyfus sets, I can't think of other roads that require cars matched to the engine.
Joe
MTH must have changed colors on those particular cars, because several years ago I had to get rid of some MTH N&W cars because the maroon color was so far off that of my Lionel engine.
As far as other roads that require cars matching the engines, maybe you're thinking only of steam (and there, the UP grey is problematic as well), because color match is going to be a consideration with pretty much every diesel engine/passenger car matchup.
