Many moons ago I had a Triang OO train set and one of the wagons was carrying
2 cable drums, possibly about the size of a 2p piece, I wondered if these have been
made in N , don't seem to be any on the G Farish website.
Also had a coal truck whose side flaps opened, probably would be a bit fragile
for N Gauge.
Can't answer your question but I, too, had one of the cable drum wagons by Triang