Trucks
All E-units used the same EMD passenger truck design by engineer Martin Blomberg. This was an A1A-A1A truck, with the outside axles powered and the inner axle unpowered. Like the well-known two-axle Blomberg B trucks, these trucks featured outside spring hangers between the wheels for better cushioning of side-to-side motion. Also like the Blomberg B, there were no drop equalizers between the axles. The success of the design is demonstrated by the remarkably few changes to it over the years.
Read more about this topic: EMD E-unit