On Tue, 03 Nov 2009 14:29:49 -0800, E27002 wrote:

Where will this tram be maintained? How will it reach that location? If
it is to reach Bletchley, it will have to be 25 kV Ac, or pulled by
another motive power unit.

My best guess is that these issues have been considered.

Siemens has already built a batch of 'Avanto' 'tram-trains' that are
equipped for 25kAC/750vDC operation and are even fitted with appropriate
train protection equipment for the area they operate in.

All you need to do is borrow one Avanto from RAPT (Paris T4) for a while
to try out.