Built in 1949, the CPR Baggage Mail Car 3704 has a 50’ baggage compartment and a 30’ mail compartment. BC Rail bought the car from CPR for work train service but never converted it. In 1998 the WCRA acquired the car for preservation. It has been restored by a team of Canada Post volunteers and now represents a typical working mail car. No. 3704 was part of a group of 10 cars rebuilt from standard Baggage mail cars in the 3600 series.