Chris asks…when and why was railroad blue signal protection indroduced?admin answers:Blue flags or signals protect railroad workers while work is in progress. I don't know when it became standard practice, but it is now part of the federal regulations governing railroads in the United States.
Here's information from Train magazine's website that will provide additional details:
When seeing blue means "stop"
By Charles H. Bogart
Published: Monday, May 01, 2006
A major consideration in
No comments:
Post a Comment