Thats not a 75 ton (76tonne) crane, its more like a 45ton, built at the same time as the 75s, but the 75s were much bigger, having the crane, stokes type weight relieving bogies and a jib runner.
As steam cranes they were built in a darkish red colour, (early 1960s) by Cowans, when converted to diesel, they were painted yellow.
The jib runners on Cowans cranes were not old bogie bolsters, they were normally two axle wagons, specifically built buy Cowans as a fixed item for that crane. They did have a well, for the main and aux hooks (75s) or main only on the smaller cranes.
Cheers
R
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