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There are various types of Tram-Trains in operation around the World and as a rule they have to be strong enough to withstand a collision with a "real" train (heavy rail).
As they are only likely to come into contact with road vehicles, conventional trams do not have to be built to such high standards so I am assuming that they would not be allowed to share the tracks with Tram-Trains. Therefore, unless Metrolink were willing to upgrade their entire fleet of conventional trams, I cannot see how Tram-Trains could be used on the system.
As has been suggested by others I think the best solution would be to upgrade the facilities available on the conventional trams rather than introducing Tram-Trains. Better interchange stations are required together with a thorough overhaul of the ticketing system.
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