The mercury is set to reach around 37°C on Wednesday — and V/Line has acted early in tweaking its timetables.
Extreme heat timetables will be in place for services on the Seymour and Shepparton lines on November 6.
A copy of the extreme heat timetable can be downloaded from the V/Line website or passengers can ask for a copy from their nearest staffed station.
Extreme heat speed restrictions are enforced when temperatures exceed 36°C in order to reduce the likelihood of train and track faults, while also keeping passengers safe.
When an extreme heat timetable is in place, journey times will be extended as train speeds are reduced.
There will be drinking water on board trains and passengers are also encouraged to travel with bottled water and wear cool clothing.
The latest public transport information and network status are available at vline.com.au, ptv.vic.gov.au or in the PTV mobile app.
Real-time traffic conditions are available at traffic.transport.vic.gov.au
Partial extreme heat timetables will be in place on the Bendigo, Echuca and Swan Hill lines.