BCM - for Diesel Locomotives
Battery Conversion Module. On/Off switch typically mounts in the shell of a diesel.
Remote Charging Jack: Battery Charging jack is on a 12" wire lead that can be mounted anywhere you choose. (Adds $10).
Connector: A quick disconnect cable for your battery pack. (Adds $3)
Charge Plug: Charging plug with wires to adapt your battery charger to the BCM 2.5mm i.d. charging jack. (Adds $10)