A pair of scammers who used cloned credit cards to steal more than £150,000 worth of rail passes to sell on the black market have been jailed (link below.)
http://www.rmtbristol.org.uk/2007/08/rail_scammers_jailed.html#more

Jucius Marcinkevicius and Ruslan Dymarchuk used the fake cards at south London rail stations including Streatham , Sutton , Crystal Palace and Wandsworth Common over nine months , buying weekly travel passes and handing them to their bosses to sell on the black market.

The scam cost rail operator Southern Trains £156,000 and forced the company to change its customer policy by limiting purchases to those with chip and pin cards.