Metro announced services were suspended this morning after an overnight theft in the Hebburn area.
A bus replacement service was drafted in, as well as a Metro ticket acceptance scheme on Go North East buses.
Services were restored as far as Chichester by 12.30pm, before Metro confirmed trains were running to all destinations by 1.30pm - though warned of delays.
A Â£1,000 reward was issued after a similar incident earlier this month, and Nexus confirmed the same incentive stood for anyone with information in relation to last night's theft.
A spokesman said: “This has been reported to the police and we are offering Â£1,000 reward for information that leads to the thieves being caught.”