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Explanation: I couldn't find an explanation in Spanish and all I could find was this, having tried several combinations with dual and pair. With no more context, it's difficult to tell!
The deceased was a shunter and it was his job to attach locomotives to trains
in the rail yard after the trains had been made up. He was also required to
double-couple all trains which had been made up by the yard shunting gang.
Prior to the accident the deceased was instructed by radio that a particular
group of wagons would need double-coupling. At that point the man took his
meal break. Following the meal break, the shunting gang moved with the pilot
locomotive to another part of the yard where a number of wagons were to be
picked up and four of those were to be pushed into the area where the wagons