01
Read the diagnostic
Compare normal and disrupted estimated journey times.
Free transit game · Underground, Elizabeth line, Thameslink and OvergroundPlay Signal Lost
Signal Lost London
Identify a disrupted segment on the Underground, Elizabeth line, Thameslink and Overground from progressive journey diagnostics.
How to play Signal Lost
02
Cross-check journeys
Unlock up to two more diagnostics when needed.
03
Find the failure
Accuse the only segment matching every clue.