Rail Code--used as a measurement of rail height. Code .100 means the rail height is .100 inches or 100 thousandths of an inch.
Rail code
The height of model rail in thousandths of an inch: code 100 measures .100" tall, code 83 is .083" tall, code 70 is .070", and code 55 is .055."
Rail Diesel Car (RDC) ...
Code - Rail code numbers refer to the actual height of the rail, as measured in thousands of an inch.
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 See also: Current, Curve, Circuit, Track, Riser
  
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