Salford train passengers are being urged to avoid non-essential travel in response to the hot weather.
Regional transport provider Northern Rail has “significantly” reduced the number of trains servicing Salford Crescent and Salford Central rail stations amid the sweltering heat.
The train operator has asked that commuters consider whether their journey is “necessary” and told those who do choose to travel to prepare for significantly longer waiting times, busy trains and short-notice cancellations.
The move to scale back services comes after an amber health alert was issued for the North West as a sweltering heatwave grips the nation.
An amber heat alert in place for Salford came into force on Wednesday and is scheduled to last until 11pm on Friday, 26 June.
Fewer trains are running between Manchester Victoria and Southport, and between Manchester Victoria and Blackburn, with passengers travelling through Salford among those affected.
A spokesperson for Northern Rail said: “Due to the continued extreme heat, we have significantly reduced the number of trains running on routes in and out of Manchester, and services remain in high demand.
“We strongly recommend customers consider whether their journey is necessary and if customers do choose to travel this week, they are advised to prepare for significantly longer waiting times, busy trains and short-notice cancellations.
“We would ask all customers to only travel if your journey is absolutely essential and to check your full journey before setting off.
“We know some of our customers still need to travel, and we are doing everything we can to keep people moving as efficiently as possible.”
Northern confirmed passengers can board trains at different times than the one they purchased a ticket for, should their scheduled journey be cancelled or delayed amid the hot weather.
“Northern tickets dated Thursday 25 June can be used on any earlier service on the same day, or any Northern service on Friday, 26th June.”
Temperatures are forecast to climb to 33C on Thursday afternoon and 34C on Friday.
The UK recorded its hottest ever June day for the third time on Wednesday, with a provisional temperature of 36C exceeding the previous June record set in the summer of 1976.
The record was broken when provisional temperatures reached 36C in Wisley, Surrey, and Gosport, Hampshire, the Met Office said.
It follows provisional temperatures reaching 35.7C in Charlwood, Surrey, and 35.8C at Wiggonholt, West Sussex, earlier on in the day.
Wednesday’s highs broke the previous top temperature of 35.6C in 1976 and 1957 as Britain has been hit by high temperatures.
The heatwave, which has led to health warnings, school closures and transport disruption, is driven by a “heat-dome” settling over western Europe that has brought extreme conditions across the continent.
The 50-year-old record has fallen as climate change is driving increasingly frequent and intense heatwaves, which experts say the UK is not prepared for.
Figures are currently provisional and would be verified at the end of the heatwave to check if it is a new national record.
Met Office science manager Amy Doherty said: “If confirmed, a new June daily temperature record would be significant, especially following on the heels of the recent records set in May.
“The new record provides further evidence that temperatures previously considered extreme are becoming increasingly common as a result of human-induced climate change.”