Blomberg B

EMD Blomberg 2 Axle "B" bogie trucks first went into service in 1939 under the EMD FT 4 Axle "B-B" locomotive series; the original "B" version plus later "M" and "X" versions were quite successful and became standard equipment on a multitude of locomotive models. They are easily identified by a prominent "swing hanger" on each side which widen the effective spring base and provide a better ride. EMD literature refers to this truck as the "2 Axle Outside Swing Hanger"; informally it is named after EMD designer Martin Blomberg; this design evolved as an abbreviation of the preceding EMD Blomberg A1A 3 axle design; see U.S. Patent 2,189,125 filed Jan29, 1938 then granted Feb06, 1940. As of this 2020 writing, EMD Blomberg B trucks are common sights under operating locomotives in North America.

EMD Blomberg B trucks

B version

The "B" version is the original 1939 design. EMD Blomberg B trucks are seen on other makers' locomotives; this occasionally resulted when buyers of new GE locomotives preferred trade-in EMD trucks and/or motors, instead of GE standard equipment.

M version

The M version (meaning "modified") was introduced in 1972 with the EMD Dash 2 locomotive series; it is also used on later models such as the GP50, GP60, F40PH and F59PH, as well as the MPI MPXpress.

Closeup of EMD Blomberg M trucks

X version

The X version (from "express") was introduced in 2007 with the MPI MPXpress locomotive series; its formal model is MPI 2237. This version directly evolved from the Blomberg M, but is longer and thus not rebuilt from older Blomberg frames.

  • MPI Blomberg X trucks on an MP40
  • MPI Blomberg X trucks on an MP54

See also

References
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