cp 4-8-4 "Northern" Type Locomotives


During the 1920's Canadian Pacific experimented with a number of designs, the 3100 series is a notable example of first engines built with a one piece cast steel frame in Canada, a marked improvement over the hundreds of individual parts in traditional frames. Despite its innovative design only two were built (3100 and 3101) in 1928 in the Angus Shops in Montreal.

These 4-8-4s, built with 75" drivers, were designed as dual-purpose locomotives. However, they were used continuously for 25 years on night passenger trains between Toronto and Montreal. In keeping with CPR practice they were later converted to burn oil.

CPR favored its fleet of Hudsons for passenger service and rejected the Northerns because it concluded that they were too heavy and too slow for main line passenger trains.

Both of these step-children from CPR's steam era survive today and are on display, one at IPSCO Inc. in Regina, SK and the other at the National Museum of Science and Technology in Ottawa, ON.

Specifications for Class K-1a
Wheel Arrangement:4-8-4
Length:97' - 4"
Drivers:75" dia.
Weight on Drivers:250,000 lbs
Total Locomotive Weight:423,000 lbs
Locomotive & Tender Weight:709,000 lbs
Grate Area:93.5 sq ft
Cylinders (dia. x stroke):(2) 25.5" x 30"
Boiler Pressure:275 psi
Tractive Effort:60,800 lbs
Tender Capacity:
Water:15,000 gals.
Coal:20 tons




Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.