BF-4 Blue Flag, “Danger Men Working On This Track”

  • Nolan BF-4 Signal FlagDurable 20-gauge steel
  • Weather-tough, baked enamel background with bold, white reflective letters
  • Economical and lightweight
  • Meet Federal Railroad Administration (FRA) rules and OSHA regulations

“Stop” and “Derail” flags are available with red or blue background. BF-2D , -6D, -9D, and -12D flags are printed double-sided; all other flags are printed on one side.

BF-4 Specs Table

Other signal flags available: