Well there is this in Edmund street Birmingham:
https://www.google.co.uk/maps/@52.480598,-1.9033979,3a,75y,4.58h,84.44t/data=!3m6!1e1!3m4!1sivK2-klHCb0drYxkxYmw0A!2e0!7i13312!8i6656?hl=en
Wrong gauge for the new trams!
Then of course the abandoned Kingsway Tram tunnel, Holborn, London:
https://www.google.co.uk/maps/@51.5189724,-0.1210061,3a,15y,165h,81.57t/data=!3m6!1e1!3m4!1sdiwT4NZOZvoO2HuUoDiWSw!2e0!7i13312!8i6656?hl=en
A lot of tramlines were just tarmaced over. There is still a lot of forgotten track in Derby just below the road surface, and I expect a lot of other places are similar.
Edited for typo!