This is a general-propose ‘can’ pole transformer. The design is ubiquitous with a pair of Primary bushings on top, secondary terminals, case ground and drain plug.
Depending on how the transformer is wired internally connections can vary. I have a series of articles on my blog .. somewhat dated but little if anything has changed. Transformers – covers the Electric Power Distribution System with other articles on what all the parts are on a transformer and wiring Three-Phase and Single-Phase transformers. Should be plenty of information to ‘wire’ transformers on a model railroad layout.
These are currently “Forthcomi9ng” as I need a successful test printing, assembly before offering for sale.
Note: The Oil Filler Plug on top and the Oil Drain Plug backdate the transformer, modern transformers don’t have these because of environmental concerns. They can be easily removed with a flick of an X-Acto knife to make them a modern design.