Use
CCRCL units are coupled to a locomotive (or a consist of locomotives) which lack remote control equipment and set to be the lead locomotives in command of the others, controlling them through their multiple unit control connections.
Until all locomotives in switching service are equipped with remote control apparatus, the CCRCLs provide an easy way of ensuring that remote control capability is available. Their use does not require taking active locomotives out of service to equip them with the remote control equipment; instead, this capability can be added when a locomotive is next scheduled for a normal overhaul.
Read more about this topic: Control Car Remote Control Locomotive
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