Box cab No 6723, built by English Electric in 1926 is in the servicing facility at Montreal Central in 1992. GE steeple cab no 6727 is also present.

CN Boxcab 6723 pulls a Vial Rail passenger train led by a F-Unit through the electrified Mount Royal Tunnel District. This was a neat operation. One I enjoyed watching for more than a few hours.

CN 6723 pulls VIA 6760 down the electrified commuter line where diesels were not allowed to operate in the Mount Royal Tunnel.