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Neat, the 3814 has the MLW style truck, they lack the leaf springs, which would be sitting centre, between the coil springs, just empty space on the MLW truck. The 3021 has the much more typical ALCO B truck. I imagine the MLW truck is like the flexicoil trucks under GP9′s. Reduced in weight for lighter rail operation.
Great observation…it makes me wonder which lines radiating from Fort Erie would have the lighter rail restrictions….I am sure someone here knows…
Just a small note, the 3814′s trucks are technically lightweight AAR-B trucks, not MLW trucks.
In addition to some CN RS18′s, CP has some RS23′s and all DW&P’s RS11′s were equipped with these trucks.
From a caption describing this truck “MLW instead of using the type B AAR truck, used a somewhat similar Canada only-design with a 106-inch wheelbase”. It seems that instead of using the typical type B found under the 3021, MLW choose a similar, lighter design, a different style. There is mention that it is found under other MLW units, it sounds like MLW made this new design a standard option for lightweight running. Kind of took this new Canadian design and made it their own. They did build and design their own 6-wheel truck though.
Regarding the discussion on AAR type B vs lightweight MLW trucks, on CP they were interchangeable on all first generation MLW power, including A & B unit covered wagons. Many photos exist of units with a mix of one of each style of truck. So far as I have seen, CN did not employ this practice.