A reward of £1,000 has been offered after copper cable was stolen from the East Coast mainline in Nottinghamshire which sparked severe passenger delays.
British Transport Police said 12 trains were cancelled and 23 services were delayed following Friday’s incident near Newark.
Services from London’s Kings Cross and destinations in north England were affected.
The reward is on offer for information which leads to a conviction.
Sgt Granville Sellers said: “This theft of cable from the railway line caused significant delays to services in the area.
“The East Coast mainline is one of the key routes that link London with the north, it is an extremely busy line, and thousands of commuters were affected by this theft.
“We are making local inquiries into the incident in the area. Anyone with information that could assist the investigation is asked to contact British Transport Police.”