Tram-train

One million passengers have used the Sheffield tram-train in the first year of its trial, according to South Yorkshire Passenger Transport Executive (SYPTE). [...] Tim Bilby, Stagecoach Supertram Managing Director, said passenger numbers and customer satisfaction had exceeded expectations, showing that tram-trains offer an affordable and efficient way to connect Sheffield city centre and Rotherham.

One of the key features associated with VLR [very light rail] vehicles is that they are not interoperable with main line trains. That is the domain of tram-trains.