I have done some minor work on the two types of hoppers I listed, but I cannot proceed any further until I have at least a height figure, but preferrably a 2D side view of the types of cars I'll be building. I am having trouble finding these, though, so I wish to receive help from you all in my search.
Instead, I spent a fair period of time finishing adding lights. Because the railings seem to have messed up raycasting, I turned it off on the front rails so that the lower lights could shine through. Here are the headlights to the two locomotives:

You can see some dimensions mapped out to the train's left. They are labeled "closed hopper" to the right, and "cylindrical hopper" to the left. I would greatly appreciate any help I can get in finding information on these.
Here is a picture of the lights from the perspective of precisely where you don't want to be:

Again, I request help in finding out more information on the physical dimensions of the cars in the rest of the consist. Unless I get such information, I will continue to simply work on the locomotives.