I know there has been a topic on here about sirens in rail yards but what about on railroad bridges? I have a link to a video made by the Penn Central Railroad company and at 23:28 you can see what appears to be a Federalcode Model 2. Was this a regular things in the 70s and can you provide any more examples?
https://www.youtube.com/watch?v=GHmyYqfNYnc
P.S. Sorry I couldn't quite figure out how the Youtube option in making this post worked so I just posted a link.