I know on some of the more modern stuff (4/4 IIs and IIIs) a red light on the rear of the lok indicates it is pushing a consist with the driver in a cab car/steuerwagen at the opposite end of the train. (Although I was told this is not a hard and fast rule, just more of a "should do")
Don't know if this applies the same way to the 2/4.
Ok you asked
Single red can be the rear of a light loco or loco on the rear of a push pull.
But! It's not mandatory as the did away with the requirement for a rear light in the 90's.
It can also mean wide load if displayed on the front with two whites as in your photo.
Three reds is an emergency warning.
That info courtesy of Gion Caprez driver and historian of the RhB.
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