Tractive Force
The amount of force at the driving wheel rims needed to start and move tonnage up various grades.
Trailer ...
Generally used in yard duty where the switcher has enough horsepower, but not enough tractive force to push long strings of cars up a hump.
Ratio of locomotive weight to tractive force. A 400,000-pound locomotive exerting 100,000 pounds of tractive force has a factor of adhesion of 4.0.
Family Lines ...
Slugs are generally used in yard duty where the switcher has enough horsepower, but not enough tractive force to push long strings of cars up a hump."
Smokestack or Stack
RAILWAYS.
A weighted locomotive unit with traction motors but no diesel engine or generator. Used in conjunction with a diesel locomotive for additional tractive force.
Smokejack
A chimney on a car or building.
 See also: Switch, Track, Diesel, Engine, Force
  
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