I've seen photos/videos of stock being unloaded using barrier wagons and a diesel (or sometimes steam) shunter effectively pulling the vehicle off the trailer - with the benefit of hindsight, this would surely have prevented this runaway in this case.
Having said that, on the Train Truckers TV series following the work of Allely's, I recall that most of the loading and unloading was undertaken using only the winch cable.
Tony
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