How did Heavy stop the train in End of the Line?

I was re-watching some of the official Team Fortress 2 SFM videos when I came across a particular scene in the community-driven update SFM known as "End of the Line". Towards the end of the video, Heavy manages to stop, or at the very least, hinder the runaway BLU train's progress as it speeds towards the RED base. I got to thinking though, how much weight did Heavy have to exactly stop? As a railfan, I knew this would be an opportune time to try to figure it out. In this video, I compare the locomotive and freight cars in the End of the Line SFM to their real life counterparts, and calculate the approximate weight of the train that Heavy had to stop. My "Trains of Team Fortress 2" video if you're interested in more trains+TF2 content:    • The Trains of Team Fortress 2   Music Used: Sonic Heroes - Ocean Palace A Hat in Time - Oh Its You Super Mario Odyssey - New Donk City Daytime Deltarune - Vs Lancer Doki Doki Literature Club Plus - Lets Teamwork Links: Instagram:   / amtrakguy365   Twitter:   / amtrakguy365   Flickr: https://www.flickr.com/people/1424538... My Site: http://amtrakguy365.weebly.com/