Angles grinders and pick axes have been used to steal cash from train ticket machines in north London.
A gang of thieves are suspected of swiping thousands of pounds from machines at stations in Barnet and Enfield as well as in Herfordshire, causing more than £100,000 worth of damage since April.
Dramatic footage shows three men British Transport Police suspect of being behind the thefts.
DC Nick Thompson said: “I am now confident this spate of thefts is the responsibility of the same gang of three men.
“They target smaller stations in the early hours when there are no staff on duty and the last train has gone.”
The gang targeted a machine at Oakleigh Park Station in Barnet on May 18, making away with £775 and causing £23,500 worth of damage.
A machine at Hadley Wood Station in Enfield was also attacked the following day causing £23,500 of damage before the thieves made away with £667.
Brookmans Park Station, Brayford Station, Watton-at-Stone Station and Welham Green Station in Hertfordshire were also targeted
DC Thompson added: “These thefts haven’t just hit the rail industry financially, they’ve also caused disruption and inconvenience to passengers, with ticket machines taken out of service for repairs.”
Call 0800 40 50 40 or 0800 555 111 anonymously with information.