Disruption is possible during the current spell of hot weather - please check before travelling.
The following links from EMR and Network Rail may be of interest.
https://www.eastmidlandsrailway.co.uk/travelling-during-hot-weather
https://www.networkrail.co.uk/stories/why-rails-buckle-in-britain/?fbclid=IwAR0LxauBwIC07qejl9Avx7-NKymu-Ostkpm4YcY1UhYE6X9mj2uZDkZIFVU
