Testing of Greater Anglia's new trains is set to take place in daylight on more routes in Norfolk, Suffolk and Essex from later this month.
Overnight test runs between Norwich, Diss and Great Yarmouth are set to be carried out by two of Greater Anglia's new trains.
The summer of 2018 was one of the hottest on record, bringing a sweltering spell and a real buzz to the region.
Buses will replace trains on transport routes across Norfolk today (Sunday).
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