Here is a MTH 20-90437 O CSX 3-Bay Centerflow Hopper Car Set (Set of 6)

Model Number: 106-5504

and a Burlington boxcar

The Trainz SKU for this item is P11665121

Williams 47977 O SF Operating Boxcar ProductID_11438391 Here is a MTH 20-90437This is Williams 47977 O SF Operating Boxcar. Santa Fe. Its key features are: operates on all O Gauge track Door opens and man throws boxes from car when action is activated by O 27 Uncoupling Section (Item No. 00207), O Gauge Uncoupling Section (Item No. 00217), or our Operating Car Remote Control (Item No. 47999) Also operates on uncoupling track from other manufacturers Fast angle wheels All metal trucks Diecast sideframes and operating couplers