Railway - Plug N Play Trains for Next Gen Intercity?

'Acknowledging criticism of the heavy Pendolino and Voyager rolling stock operated
by Virgin Trains, Alexander noted that "more mass equals more energy consumption.
Lighter trains are good for the environment, because they consume less energy. They
hammer the track less hard."
A flexible design which could easily be lengthened or shortened was essential, he
added, both in commercial and environmental terms. "A full train is much more energy-efficient
than one that's half-empty," he said.
The transport secretary concluded: "So, we now have a much clearer idea of how the
future will affect our Intercity Express. A lighter, more efficient train, with better
acceleration, that offers a far greater number of route choices and service options.
Flexible power options and flexible configurations; more accessible coaches; with
anticipated shorter engine replacement cycles to allow for a faster change in technology."'