Comment by Empact

As this page notes: https://www.coventry.gov.uk/coventry-light-rail/coventry-lig...

They're using "Standard rail components, innovative construction" - standard gauge rail, but laid over a foundation of slab ultra-high performance concrete (UHPC), which allows for the shallower foundation / avoidance of utilities relocation.

Using UHPC to rethink infrastructure is the big story here, I think.