Here's an interesting photograph that was taken at the Juniata Shops of Norfolk Southern in Altoona, Pennsylvania. You can see a Federal STH-10 on top of the roof.
https://www.flickr.com/photos/cesposito ... 6/sizes/k/
This Federal Model #2 was shot at the East Deerfield Yard of the Boston & Main Railroad.
Any other railroad yards out there that have outdoor warning sirens?