I have the 1AAA battery powered one and it moves along steadily. The more carriages it pulls the slower it is. I do need to recharge the batteries quite often but having a usb one might better as then you don’t have to pull out the screwdriver each time
We have this, it's quite slow but can pull a decent amount. I think it goes a bit faster backwards than forwards. The front 2 wheels move freely side to side too so its best on the track.
More plastic from Brio - once makers of quality wooden toys - albeit still at vastly inflated prices!
The day when steam train is usb rechargeable..