They have underbodies and trucks specific to the car types

This is an Accurail HO 37494 Southern Pacific/Texas & New Orleans 41' Steel Gondola 3 Car Set

rooftop air conditioners and vents

The Trainz SKU for this item is P11542845

This is Trix 22029 HO DRG Class G 5/5 Heavy Freight Steam Locomotive with Tender #5856

Fox Valley Models 85009-1 N GACX 4750 3-Bay Hopper Lt Salmon #469619 DwDetails-8.00-6.90-20.00-8.00-6.30-4 They have underbodies and trucksThis is a Fox Valley Models 85009 1 N GACX 4750 3 Bay Hopper Lt Salmon #469619 . It features plastic construction, metal wheels and axles & has knuckle couplers. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Fox Valley Models Model Number: 85009 1 Road Name: GATX Corporation MSRP: $26. 95 Scale Era: N Scale Model Type: Freight Cars The Trainz SKU for this item is P12302267. Trainz Product Id: 12302267