Bloody good question that Dean, the scotch derricks date from the 40s i think and despite years of research theres very little information out there regarding the cranes.
What i do know is they where rated at 5 ton SWL and had a 120 foot jib, the crane on the left lasted until the ‘hurricane’ of 87 that did so much damage that meant it was too expensive to repair.
The small steam crane pre dates Shaw Lovell ownership, they took over in 1922 and started to redevelop the wharf.