There is a separate circuit supplying 15 Volts of constant power

This is a Bachmann 15007 HO Santa Fe 40' Steam Era Boxcar #136287

Can simultaneously control one or up to four servos by using one toggle switch or push button

Here is a Micro-Trains 02000166 N Great Northern 40' Standard Single Door Boxcar #19038

This is a Lionel 6-82657 O Western Maryland 60' Single-Door Boxcar #38020

Noch 58296 HO Concrete Foam Tunnel-Style Culvert: 3-1/8 x 1-11/16 ProductID_12260605 There is a separate circuitThis is a Noch 58296 HO Concrete Foam Tunnel Style Culvert: 3 1 8 x 1 11 16". Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Noch Model Number: 58296 MSRP: $24. 99 Scale Era: HO Scale Model Type: Accessories The Trainz SKU for this item is P12153738. Trainz Product Id: 12153738