Suzanne,
The info you quoted from MTH was not complete. Here is the full "picture."
"Cab No. 12 Features: Constant Voltage & Directional Lighting, Flywheel Can Motor w/Ball Bearing Drive Train, Fire Box Glow, lighted Cab Interior w/Figure, 3 Rail Models Have Enhanced Proto Sounds-Smoke-Coupler A Premier Model."
Over the years, MTH has produced engines that operate conventionally (by way of a transformer with something to move to change train speed or direction) and that operate with command control (transformer applies set voltage to track and handheld remote allows user to change a lot of engine characteristics). To my knowledge, MTH no longer makes engines that only run conventionally, but the newer ones are dual option capable.
It appears from your box end that said 2-rail engine is only able to run conventionally. For some model railroaders, that is a plus, for others, that is a negative.
Good luck with your continuing sales efforts.
Chuck