https://tstage9.wixsite.com/nyc-modeling
Time...It marches on...without ever turning around to see if anyone is even keeping in step.
Fear an Ignorant Man more than a Lion- Turkish proverb
Modeling an ficticious HO scale intergrated Scrap Yard & Steel Mill Melt Shop.
Southland Industrial Railway or S.I.R for short. Enterchanging with Norfolk Southern.
Pillar cranes like the ones in the photos were common in Queensland and many other places during the steam era. They were situated near the freight shed and commonly on the end of a platform which could be wood, dirt or concrete. I have seen them lift all types of freight from agricultural machinery like disc ploughs, crates, drums, bundled timber and wool bales. With a capacity of between 2 and 5 Tons they would be used to lift freight to and from trucks, the platform and flat cars and drop-side gons.
Gantry cranes straddled the load and as you decribed had a trolley that generally moved across the gantry beams and sometimes the whole gantry moves parallel to the track or the road. These style of cranes were used for narrow/standard gauge transfers and in more recent times shifting shipping containers between trucks and flat cars.
A couple other types of interesting cranes are stiff leg derricks and log loaders
Darren