Low Arm
A restricting signal in the days of the semaphore with the arm down 45 degrees.
Low Irish ...
Low Arm A nickname for a restricting signal in the days of the semaphore with the arm down 45 degrees. Low Irish Stands for medium clear signal.
Locomotive Locomotives are units propelled by any form of energy, or a combination of such units operated from a single control station, used in train or yard service Low Arm A nickname for a restricting signal in the days of the semaphor ...
 See also: Point, Triple Valve, Train Line, Train Brake, Train Register
  
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