so the operators did not have to wear additional protective gear

This is an MTH 20-2694-1 Chicago

the model will feature two different sized wheels

Completely Assembled

LGB 45170 FRR Double Drum Cars ProductID_11387108 so the operators did notHere are LGB 45170 FRR Double Drum Cars. These flatcars feature plastic trucks, latch couplers and plastic wheels and metal axles. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: LGB Model Number: 45170 Road Name: **** No Road Name Scale Era: G Scale Model Type: Freight Cars The Trainz SKU for this item is P11391121. Trainz Product Id: 11391121