S stock on the Met.

[al]

PVR? Or am I just being tired and having a blonde moment?

PVR = Peak Vehicle Requirement, in other words the number of trains (in this instance) needed at the busiest time of day to cover all the trips scheduled. It is a key figure in the transport industry, as first and foremost the engineering department is trying to supply enough vehicles to hit this figure.

[Garion]

Ahh thanks