Since the FT was a four-axle locomotive Blomberg modified his three-axle A1A truck (meaning the two outside axles were powered with traction motors while the center was not) into a two axle version. What became known as the Blomberg B carried an arched chassis with outside swing hangers that produced a higher quality ride (arguably the best among all early types). Additionally, it used a combination of stiff and soft coil springs to reduce dampening. All Blombergs were also equipped with roller bearings, an upgrade that first appeared on late era steam locomotives to greatly reduce wear and tear on the running gear. While it is unknown if railroads ever addressed the matter given everything else the new FT showcased, the high quality of the Blomberg was almost certainly another factor in railroads choosing diesel over steam.
This original Blomberg truck remained EMD's standard on its entire four-axle, F series and later General Purpose (GP, or Geep) series through the early second-generation models. These included all of the builder's popular designs that solidified its standing as top manufacturer during that era such as the F3, F7, FP7, F9, GP7, GP9, GP30, GP35 and many others. The popularity of the Blomberg could also be seen in the number of railroads which preferred them over AARs, sometimes even requesting that General Electric use them on its early road-switchers. Of course, Blombergs tended to be more expensive than their counterparts and some roads elected to have trade-in Alcos, Baldwins, or Fairbank Morse models reuse the truck chassis (which typically carried AAR Type Bs).
When EMD added its "Dash 2" line to its catalog during early 1972 (which, among other improvements, featured upgraded electronics for easier maintenance) it also slightly updated the Blomberg truck to further enhance ride quality and reduce maintenance. The Blomberg M used hydraulic shocks on opposing ends of each journal box and rubber pads also replaced the leaf spring suspension system. Additionally, the truck was simplified by using only four brake cylinders instead of eight since these still offered adequate stopping abilities (several railroads had already modified their B types like this to save on maintenance). The GP60 was the last production-scale EMD locomotive to sport Blombergs, appearing on Santa Fe's final order in 1989. Today, since the truck was equipped on thousands of EMDs during a 50-year period Blombergs remain in wide-scale use all over the country. To read more about EMD's Flexicoil truck please click here.
For more reading on EMD locomotives consider the book EMD Locomotives from author Brian Solomon. The book highlights the history of EMD from its earliest beginnings in the 1920s, to its phenomenal successes in the mid-20th century, and finally its decline into second spot behind General Electric in the late 20th century and eventual sale by General Motors in 2005. The book features 176 pages of EMD history and is filled with excellent photography and illustrations. Another good title regarding trucks and identifying diesel models is Gerald Foster's A Field Guide To Trains, which provides information on how to ID different designs from the earliest FT through those released into the 1990s. If you're interested in perhaps purchasing these books please visit the link below which will take you to ordering information through Amazon.com, the trusted online shopping network.