Sunday's high temperatures, believed to have reached 32C, are suspected to have caused a railway power rail to bend, disrupting many trains today (July 18).
Transport company Southern Rail first reported disruption at 1.52pm on the line from Lewes towards Brighton.
By 3pm, the train provider said the track owners Network Rail had found a kink in the third rail, which provides power, understood to be supplied via a 750V DC system) for locomotion.
Two hours later, staff told customers that engineering teams had 'clamped' the dent in place, allowing services to resume.
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