Also, what about places where trams and 'full size' trains run on the same track?
As previous posters have said not at the moment although I'm not sure if the Sheffield Huddersfield is still down for tram train.
But it's not a true tram train because it won't run onto the town network in Sheffield and won't share tracks with mainline trains.
Tram trains are found in Germany standard gauge around Karlsruhe and Kassel and meter gauge at Norhausen.
I've travelled on a steam special (Class 50) on one of the Karlsruhe lines (S31, S41) to Baiersbronn the line being electrified at 16 2/3 Kv (Standard mainline voltage) and also on the Kassel Dual Voltage trams.
The Karlsruhe network is 73 kms town and 430 kms Regio! and has approx 120 dula voltage trams.
Kassel has both dual voltage 18 and 10 Electro Diesel trams. network is 48 kms town 20 interurban and 133 Regio both electric and ED.
Nordhausen has 3 ED trams sharing tracks (11Kms) with 1897 0-4-4-0 Mallets.
I think the Germans think their safety systems will prevent any collisons between trams and trains and therfore it doesn't matter about having crumple zones.