A fantastic concept that will hopefully come to reality very soon. It makes perfect sense to use the energy from PV directly to power the UK railway system. With integrated energy storage systems, PV energy could power trains day and night. As this article points out this idea would enable many rural PV projects to be undertaken that wouldn't previously have been able to connect to saturated grids. Bypassing the grid altogether gives the freedom to connect PV to the railway line exactly where it is needed. 

With the entire Dutch railway system now powered by wind energy, they have set the tone for others to follow.