TLDW: skipped through until 25:47: the rail doesnt lengthen it just extends to the tops and sides.

That isn’t really true though. He never talked about ‘sun kink’ which is a thing. Apparently mostly due to poor ties and bedding.

There’s a neat discussion I found on some forum

So it appears the topic wasn’t able to be covered fully in 30 minutes, let alone 5. But I do agree he adds a lot of fluff and it gets annoying. The thermite manufacturing guy needs a channel.