Road Unit - A diesel locomotive built specifically for mainline service. the wheels and axles are of a more heavy duty design, and the gearing of the traction motors are more appropriate to the higher speeds.
Road unit
A diesel locomotive designed for getting trains over the road rather than for switching cars. A road unit has trucks that ride well at speed, gearing that keeps traction motor speed down and axle speed up, and a high-horsepower prime mover.
I seem to recall there being at least one former BN unit, one ex-Milwaukee Road unit and one Conrail unit with us on that eventful evening. I do remember there being either four or five units in our locomotive consist.
 See also: Yard, Engine, Grade, Locomotive, Engineer
  
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