The physics of pulling something with steel wheels on a steel track make the demo a lot less impressive than it sounds.

To illustrate, consider that the world record for a single person towing a train by a strap held by their teeth is 280 tons.

How fast you can accelerate that mass it is the real question.

Humans can pull trains. There's plenty of video of that on YouTube. They're made to roll as effortlessly as possible.

Here's a bunch of HO scale (1:87) trains pulling their full sized version, too: https://twitter.com/mrtimdunn/status/1101414657418498049

You can literally push a train car on flat ground by leaning on it long enough.

Didn't Top Gear once pull a train with an MGF? I'm not sure this proves anything.