Blue Flag
A blue flag or signal that is placed on a car or locomotive when workers are around or under it. When a car or locomotive is blue-flagged, then it must not be coupled to or moved in any manner.
Blue flag
Blue-colored flag, sign, or light which indicates that the rolling stock it is placed on or near may not be moved because employees are working around or under it.
Bonded ...
Blue - blue flags are placed on a car or other object on which men are working.
Lantern and Hand signals ...
These HO scale blue flags clip onto the railhead and create visible markers for the crews to follow. Blue warning signs like these are available from NJ International in HO and O scale.
Blue Flag/Blue Signal A portable clearly distinguishable blue light, flag or marker placed on or near each end of an LRV or other rail vehicle to protect it from being moved energized or coupled to another LRV or rail vehicle.
From the center booth hung the yellow flag of Tepus, the famous bow bearer of the King; next to it, on one hand, was the blue flag of Gilbert of the White Hand, and on the other the blood-red pennant of stout young Clifton of Buckinghamshire.
WEARING THE BLUE"Delayed by car inspectors. A blue flag or blue light is placed on cars thus delayed and being worked on ...
 See also: Current, Track, Signal, Switch, Train
  
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