A "PERSISTENT, dedicated" vandal from Uckfield will be sentenced at Southwark Crown Court on October 10.
Unemployed William Setzdemspey, 19, of Hillmead, and three others caused £100,000 worth of damage to railways and rolling stock across the South East.
Together with Tom Collister, Darren Austin, both 22, and Joshua Phiel, 19, he was a member of the JKS (Just Kant Stop) and the FDC (Forever Doing Crime) vandal gangs.
Vehicles belonging to Collister and Setzdempsey containing spray cans, masks and other materials were seized by police.
The Uckfield man was linked to the graffiti tags NOIS and JKS.
Police also retrieved text messages showing how the gang pre-planned their work, including one stating: "Safe M8 U up 4 doin a live tube plot 2nite."
Tags belonging to the group were found in East Grinstead, Redhill, Woking, Tonbridge, Epsom, Bletchley, Horsham, Hastings, Tunbridge Wells and Ramsgate.
DS Peter Thrush said: "Numerous bits of graffiti paraphernalia were seized during various house searches. Many had tags linking back to each of them on everything from railway timetables to shoe boxes, with even a pair of slippers being seized with their tags on it.
"These people are persistent, dedicated vandals. The court has recognised the seriousness of the offences, the risk these young men take with their lives and the cost to the train companies and public of south London.
"I would rather see people go to court than go to the morgue."
Setzdempsey, Austin, of Mackenzie Rd, Beckenham, Collister, a glazier of Cherry Tree Way, West Wickham and Piehl, a student of Speldhurst Road, Tunbridge Wells, have all admitted conspiracy to cause criminal damage between 2005 and 2007.