Why are trams not narrow gauge?

[Ken H]

I have started a new thread on gauges generally

https://www.railforums.co.uk/threads/48-1-2-v-53.174774/

 

[bastien]

Nowadays what they tend to do in 100% low floor trams is have the majority of the bogie under the floor purely consisting of a structural U frame, all the gubbins are on the extreme edges surrounding the wheels. So floor height is actually below the height of the bogie edges and your walking through the centre of the bogie.

This Russian bogie is a good example.

https://www.metro-report.com/uploads/pics/tn_uvz-r1-tram-bogie-impression.jpg

Or this CAD model.

https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/aed489ab46e2a00320cfb8b68da5ec9b/large.JPG

That's pretty much how Talgo works too.