The Trainz SKU for this item is P11479172

090 diameter EL wire

Hinges and latches

but there are many examples of these cars being shuttled between mills miles apart

Here is a Magnuson Models 439-968 HO Scale Maintenance Truck Kit

Revell 2085 HO Gravel Plant Plastic Model Building Kit VariantsUnitPrice_number_17.60 The Trainz SKU for thisThis is a Revell 2085 HO Gravel Plant Plastic Model Building Kit. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Revell Model Number: 2085 Road Name: **** No Road Name MSRP: $59. 99 Scale Era: HO Scale Model Type: Building Kits The Trainz SKU for this item is P12376670. Trainz Product Id: 12376670