Hello Richard,
I'm sorry I didn't get back to you before, but I've at least have had a play with gmax on & off the last month.
This image is taken inside TS2009 as I only uses that for my little Trainz play now a days - but the model it self is TRS2004 upwards in the config.
I've raised the bin about 1,7 meter off the ground, moved the center line for the lower track further out - and extended the bin it self upward with two more meters raising the amount it holds with quite many more liters.
I haven't split the coal load into separate bins though, but I reduced the triggers from 4 to 2 on the lower track, and thanks to wonderful help a few weeks back made two and two chutes work together.
I've added a little more braces to the bin side, off centered the upper track as else I would get problem with the 3' trestle track I uses that matches the bin textures as it interfered with the lower track.
I still need to add a few more braces and bents to the bin it self as it looks way to flimsy and not very correct - and then I need to fix the LOD for it.
May take a month more, but it is getting there. :wave:
If you want to have a play with it now, it can be arranged, it was the main reason for making this post int he first place actually.
I don't know which Trainz version you run, if it is TRS2004, TRs2006 or newer, but I can provide you with a zipped folder of the model as it now stand.
It is a little harder to get into the game as it is not a cdp file (as of now, it will be later) if you run TRS2004, TRS2006 onward should be easier due to CMP - especially easy in TS2009 as I can overwrite earlier models without need to up the version number - easy to test for me that way.
Either way, I will play some more with the look of it, but at least it seem to work.
I hope I have made the sizes fit you, I tried to use the hopper you mention, I used a view program to get the dimension of the hopper, and went from there.
I don't have that wagon/car in my Trainz install though, so I haven't actually tested it against the wagon you uses.
Best wishes
Linda