Trainz Product Id: 11399865

and early steel cars were largely non-standardized

Prototype: Four German Federal Railroad (DB) type Otmm 57 dump cars

Here is a SoundTraxx 820080 HO Scale Digital Sound Decoder for Life-Like 0-8-0 Steam

Model Number: 23-401

Atlas 5623 N 2B Off Side Hopper Georgia Railroad (Pack of 3) ProductID_11440688 Trainz Product Id: 11399865This is Atlas N Scale Ready to Run 2 Bay Offset Side Hopper Car 3 Pack Georgia Railroad. Features: Prototypical painting and lettering Plastic body with diecast chasis Removable coal load. Additional Information: Atlas' version of the 2 Bay Offset Side Hopper with Flat Ends is modeled after the open hoppers that were built in the 1930s and the 1940s to transport coal. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9)