There is a socket built into the rear of this A unit locomotive to supply power from the decoder to the speaker in the B unit locomotive that was made to accompany this engine

Car numbers/names: Sleeper car 1: Nashotah

Model Number: DZ-1090-80-2

Model Number: 933-3049

Taxi (silver and black)

MTH 20-98744 Northern Pacific Crane Car ProductID_11448465 There is a socket builtThe main features of this item are Intricately Detailed Durable ABS Body, Metal Wheels and Axles, Colorful, Attractive Paint Schemes, Operating Diecast Metal Couplers, Moveable Hook & Boom, Fast Angle Wheel Sets, Needle Point Axles, 1: 48 Scale Dimensions, Separate Metal Handrails, Diecast 6 Wheel Truck, Unit Measures: 18 1 2 x 2 5 8 x 4 1 8, Operates On O 31 Curve Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9)