mechanical blue signal history, anyone know?

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S

SuperToad

New Member
Does anyone know the history of using the blue signal for mechanical people working on rolling stock? I know it was made federal law by cfr 49 part 218. But im wanting to know when it started.
 
S

SuperToad

New Member
now i know the 218 came law in the 70s sometime.. and I know carmen were using blue flags long before that!
 
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