The neutral temperature is 27C, we may have to follow countries further south in setting it higher.
>Why don’t we replace all our rails with ones stressed for higher temperatures?
> <snip> ... there would be the risk of increased tension on the rails in the winter.
From an accident report:
> The area surrounding the 67 km point had been subjected to several maintenance activities, including a few days before the derailment. The records showed that a length of rail was installed at about the 67.150 km mark when the rail temperature was about 65°C
> According to BHPB, the stress-free track temperature was 40 °C. This specification was based on midpoint average minimum and maximum temperatures expected for that time of year (summer).