This is an article I have just written. Enjoy.
Excerpt:
The Association of Train Operating (in a vague sense) Companies, or ATOC, is proposing that commuters using the network at peak hours - all the time, then - will have to pay a surcharge above and beyond the price of their ticket.
ATOC? ATOSS more like, as in "We don't give ATOSS about the primary users of our service".
The perfectly balanced and not in the least deranged reasoning behind this monumentally stupid brainwave is that the railways leading into central London are overcrowded, so commuters must be deterred from using them. That's already complete lunacy if you consider that many commuters ARE deterred from using them by the fact that they are miserably overcrowded - your previous brilliant deterrent strategy is working, lads - and those who willingly fork out a king's ransom each year to complacent, larcenous and lazy train operating companies in order to have the privilege of spending two hours a day standing in a stifling metal box with their face wedged into the armpit of the sweat-drenched suit beside them are very probably likely a captive audience who take the train because they have no alternative.
So this isn't a charge intended to act as a deterrent. For many if not most commuters, it is a heavy tax of a necessary and vital service that they will simply have to shoulder.
The rest:
http://www.londonist.com/archives/2005/06/a_congestion_ch.php