Rail services across the Central Belt have been hit by delays and disruptions after the heatwave affected train tracks and signalling.
Problems with lines around Edinburgh Waverley, compounded by a signalling problem, have affected services in the east and across to Glasgow.
Network Rail said the highest recorded rail temperature today was 43C in the Kincardine area, and 38-40C generally on much of the network.
At Waverley, a track circuit failure east of the station caused loss of control to signals for platforms 1-4. A points failure west of the station hit line 5.
Both incidents were due to excessive heat, Network Rail confirmed.
There was also a points failure at Glasgow Central, afffecting the Barrhead line, although the cause was not specified.
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