> Train speeds are limited in high density areas for safety. There are plenty of places in Europe where 100mph+ running through urban areas is common. Urban v.

> Train speeds are limited in high density areas for safety. There are plenty of places in Europe where 100mph+ running through urban areas is common. Urban v. rural isn't really a consideration for line speeds here. Heck, most of the mainlines north and west out of London reach their 125mph top speeds while still within Greater London. The question here is more about the presence and type of at-grade crossings, and there's a fair number on lines with 125mph running.