The hot weather is causing both Network Rail and operators numerous headaches.
As the temperatures climb so do the number of speed restrictions applied across the network.
In Derbyshire one 'community rail line' saw its service suspended yesterday and a replacement bus service in operation - due to concerns about lightly ballasted track.
Meanwhile the BBC is suggesting that the heatwave may have resulted in a minor derailment on the Cumbrian Coast line.
It will be interesting to hear how the TOCs rate Network Rail's overall management of the hot weather conditions.
Presumably Virgin will fire the opening salvo?
