For a Diesel or Steam Locomotive this is where the Fuel Capacity is defined as a Bulk Cargo def.

A MU can have its Passenger Doorways defined here, as Passenger Doorway Defs.

A FMU can have a Container Loading point defined here, as a Container Cargo Def.

Passenger seat Def is not currently used, but was intended for automatically generating passengers as the train loads or empties.

Position & Element

This is the point (adjusted via the Preview window) where the container will be loaded

Trigger Box	This is the size of the trigger box used for refuelling from Loading Points. The bigger the box, the easier it is to line up with the Loading Points. Width: Specified in meters Height: Specified in meters Depth: Specified in meters Element: Not Used. The cargo position has to be positioned (if different from the models origin of 0,0 in the Preview window
Capacity	Maximum Capacity in gallons for liquids, lbs for solids
Bulk Freight Type	Select what the freight type is, here
Animation ID	If there is an animation for when the engine is loading this freight, specify the name of that animation (as set when modelling the geometry) here
Blueprint Set ID	Enter name of provider and product
Blueprint ID	Specify the location to the Cargo Blueprint

Door Side	Choose which side the doors for this reference are located
Offset X / Z	Position of each door
Rate Per Second	This is the number of passengers that can use the door per second