It would be interesting to have numbers and basically the reasons cited for the withdrawal, just so that we get a sense of what's really important to your board.
In terms of fitness, fitness will obviously have some specific criteria attached to it as you assess who gets the certificate, or what they need to get it, but operating practices are changing. Trains are longer, they're heavier, and faster, in some cases. Would there be changes to what constitutes fitness according to the operating realities of the various lines?