Social Media Team
Looks like the chain tensioning device isn't working properly. Usually that would absorb this pulsing, which is a result of the chain acting like a spring when the train engages.That's ... not right. Seems like a reverberance around the chain, probably from the coupling of the train to the chain. That can't be doing the gear box / bearings any good!
For anyone that's ridden it, can you feel the lurching on the train? It's not uncommon to get a bit of that, but usually it's dampened down quite quickly.