Central Trains had faced a �300,000 bill every year to clean graffiti from its stock.

The train company says vandalism across its network has been cut by 75%, and it is now putting up cameras in sidings near Leicester and Cambridge stations.

The cameras are motion-sensitive and start when carriages are approached.

Central Trains operates services from Birmingham to locations across the East and West Midlands.

There is a big flash and a loud message telling people that the police have been informed.

The first cameras were installed in January at the cost of around �1,300 each.