For most routes the RPO operation didn't require the space afforded by an entire car so the Post Office was partitioned off and the remainder of the car used for baggage and express service

Here is an MTH 30-90007 Assembled Public Works Building

The Trainz SKU for this item is P12185168

They weighed in at 559

MTH 20-21156-1 Union Pacific SD70ACe Diesel Engine #9096 w Proto-Sound 3.0 ProductID_12174129 For most routes the RPOHere is a MTH 20 21156 1 O Gauge Union Pacific (Flag) SD70ACe Diesel Locomotive with Proto Sound 3. 0 (Hi Rail Wheels) #9096. It features: Intricately Detailed, Durable ABS Body, Diecast Truck Sides, Pilots and Fuel Tank, Metal Chassis, Metal Handrails and Horn, Moveable Roof Fans, Metal Body Side Grilles, Detachable Snow Plow, (2) Hand painted Engineer Cab Figures, Authentic Paint Scheme, Metal Wheels, Axles and Gears, O Scale Kadee Compatible