Rail end warming of BS11 wear resisting grade B prior to thermit welding in cold weather (TM-MF-115)

BRB Civil Engineering Handbook No 32, Section E.4.1 states that when thermit welding wear resisting Grade B rail and "the rail temperature is below 5°C, following correct alignment of the joint and prior to the fitting of the moulds, both rail ends for a distance of 500 mm from the...