Railroadforums.com is a free online Railroad Discussion Forum and Railroad Photo Gallery for railroaders, railfans, model railroaders and anyone else who is interested in railroads. We cover a wide variety of topics, including freight trains, passenger and commuter railroads, rail news and information, tourist railroads, railway museums and railroad history.
6-21-39 - Date it was built
5-4-73 - Last Date it was in a shop and rebuilt
48 - 50 FPM - 48 to 50 Flashes per minute - It's a flasher relay for a grade crossing.
The rebuilder would have had to open the case to rebuild it. Its likely that there was a similar label inside showing the original build date. The rebuilder replaced that label with a new one, showing both dates.
This is just conjecture on my part, of course, as I wasn't there.
RailroadForums.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com
RailroadBookstore.com - An online railroad bookstore featuring a curated selection of new and used railroad books. Railroad pictorials, railroad history, steam locomotives, passenger trains, modern railroading. Hundreds of titles available, most at discount prices! We also have a video and children's book section.
ModelRailroadBookstore.com - An online model railroad bookstore featuring a curated selection of new and used books. Layout design, track plans, scenery and structure building, wiring, DCC, Tinplate, Toy Trains, Price Guides and more.
Affiliate Disclosure: We may receive a commision from some of the links and ads shown on this website (Learn More Here)