Sure! MTH Z4000 remote, Lionel Powermaster, or the ZW-L I mentioned previously, controlled remotely with a Cab-2. In each of these applications you would be varying the track voltage (as opposed to true "command control" which is constant voltage on the track modulated by a decoder in the loco.)
This will blow your mind, but there's an absolutely bomb-proof, low tech way to control two Postwar locos independently by using different polarity. It involves the use of diodes and rheostats, or optionally, silicon-controlled rectifiers. If you can find a rheostat built into some kind of belt pack, that would give you robust walk around simultaneous control of two (but not more than two) postwar locomotives by means of easily reversible modifications.
