The Class 13 (A Tinsley TIC CLass which BR Accepted without batting an eye)
two class 08 shunters one with all controls removed and the desk plated over the cab was removed and the loco ballasted to be the same weight
the loco (as a unit) was then controlled from the remaining centre cab
but as far as I am aware there were not independent throttles for each engine
watching these from the bridge was a little daft as they went over the crest of the hump and seeing the wagons running away down different roads
Personally
I would have designed these like a pair of 20's normally ran and left both cabs in place and had separate throttles for the engines
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