The company scrapped all but a few early-morning services yesterday as temperatures soared to 40°C.
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Thameslink, which shares the Midland Mainline, has also cancelled all its trains between London and Bedford.
An EMR spokesman said: “Safety inspections are required to check tracks and overhead wires as no trains ran yesterday.
“We expect our Intercity and Connect services to resume of the route at 10am after the safety inspection is complete.”
The company faced criticism from passengers for cancelling services on Tuesday (July 19). But other operators’ attempts to run emergency timetables backfired as passengers were left stranded when infrastructure failed.