M Version
A modified (M) version of the truck called the Blomberg M was used starting with the four-axle Dash 2 series locomotives. Hydraulic snubbers (shocks) were used on diagonally opposite (front right and rear left) journals, and the leaf spring suspension was replaced with rubber pads. This version had only one brake actuating cylinder per side and revised brake rigging using threaded adjusters, reducing the number of brake shoes to 4 versus 8 on the earlier B model.
There is also a later variation of the Blomberg M found on the GP60 and F59PH models. The main spotting features of this version are leaf spring suspension (as opposed to rubber pads) and exposed roller bearing ends, along with damper shocks between the trucks and locomotive carbody to reduce sway. Similar looking trucks can be found under modern MPI MPXpress locomotives.
Read more about this topic: Blomberg B
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