Personally I compare the T&W Metro more to the London Underground than a tram system.
Ie a self contained railway system
Metrolink t68 trams were as heavy as a pacer 45 tonnes. In comparison to there current 39 tonne M5000.
I remember seeing (quite late at night) an 08 taking an load of engineering wagons right through the centre of Manchester (circa 2006/7) - on the Peter's Square to Market Street leg - presumably for work to the Metrolink system somewhere. I heard that they adapted the 08 by putting rubber on the wheels or something like that?
Ah, but the T68s had two more axles (hence only 2/3 the axle loading and thus pressure on the track).
That does sound plausible - I did spot some 08s on the Metrolink tracks around that time. However, the bends around Market Street are pretty tight and then there is the problem of the late-night drunks. I would have thought that the movements would have been over heavy rail - as there is a choice of combined routes across the city.
However I don't believe they could have got into the city centre street track as their railway wheel profiles would have derailed on the grooved rail or points. Nor have I ever heard any previous indication that this ever happened, which would surely have become public knowledge if it had.
Pretty sure it was an 08 I saw rumbling through!