Most steel hoppers followed what quickly became the standard layout of two saw tooth hoppers and outside bracing for the sides

Model Number: 402

The Trainz SKU for this item is P11494054

It aligns well with cork or Homasote applications

Today tanks similar to these are being used to hold oil and chemicals

MTH 30-74813 O Providence & Worcester RailKing 50' Modern Box Car #167 VariantsUnitPrice_number_69.95 Most steel hoppers followed whatThis is a MTH 30 74813 O Providence & Worcester RailKing 50' Modern Box Car #167. Key Features: Intricately Detailed Durable ABS Body, Metal Wheels and Axles, Diecast 4 Wheel Trucks, Operating Diecast Metal Couplers, Colorful, Attractive Paint Schemes, Opening Car Doors, Decorative Brake Wheels, Fast Angle Wheel Sets, Needle Point Axles, Unit Measures: 12 7 8 x 2 9 16 x 3 9 16, Operates On O 31 Curves. Condition: Factory New (C 9) Operational Status: