I have come to posses an RW Trainmaster controller that isn’t like a standard variation of the RW.
It has a red whistle button and a black direction button.
I don’t know if it is an original that has had a bad restoration at some point, a fake, or a variation that is so rare it hasn’t been confirmed.
I thankfully paid nothing for it, so I didn’t waste any money.
It is a Multi-control Trainmaster 110 RW Watt 115 volts and 60 cycles.