 Heat from the boilers kept the oil warm and prevented it from becoming too viscous in cold weather.In New Zealand the R class and S class single Fairlies and the B class and E class double Fairlies were ordered in the 1870s for use on the narrow gauge () system built under Julius Vogel's 1870 "Great Public Works" programme to open up the country.Three of the S class Fairlies were sold to Western Australia Railways in 1891.