Looks great, the single bottem dump and box car came out great, do you weather them ? and do you have a steam engine to pull them ? if so would love to see it.
I use to have a HO scale train, use to build and modify RR cars and engines along with model cars and truck, i compleatly scratchbuilt my trains from the ground up starting with a scratch built engine to fit over the electric motor, then parts from different tains to make unique yard mules and shunters for the steel and iron foundry i had also scratch built, spent so many hour's studying pictures and sneaking into rail yards to look at the engines and RR cars, someday i would like to get back into it, very relaxing, thanks for posting this, good memorys for me.
This is what i am working on at the moment, here is a photo of the prototype i am basing my model on. It is a Great Northern Railway of Ireland "Q" Class 4-4-0 No.131.
I started with a Hornby Southern class T9 wide cab in green.
This is as far as i have got so far. Still needs a few more details and a proper paint job.
Also have a Coras Iompair Eireann GM 141 Class Bo-Bo loco.
Plus R.P.S.I. coach set and various other engines, carriages and wagons but dont have photos of them.