The class J locomotives were designed for the electrification of the northern half of the D&H, so they were built as hood units instead of as boxcabs. They are slightly higher horsepower than the prototype, and use a smaller, but equipment-free, cab.

18 were built in total – 10 for the PV&T, 3 for the M&B, and 5 for STCUM’s Deux Montagnes line.

Over the years, the class J motors have been slowly upgraded to class JS specs and those rebuilt units can be found almost everywhere on the electrified system.

The M&B units eventually found their way onto the PV&T roster after the PV&T & CV purchased the M&B, as did the Deux Montagnes units, which were purchased after Exo retired them (Deux Montagnes was converted to a light metro, so Exo no longer had any use for railway gauge motors.)