Interesting video sent to me here:

https://youtu.be/q821GJpEVqE?si=P96n7GuvSybfl2QE

Great old footage from the time, but in particular around 13 minutes there's quite a detailed view of Grant Lyon Eagre tamper in action. Possibly the one that is now TSF51050

https://www.ontrackplant.com/photo/tsf51050