Superheating of the boiler was first applied to number 3702, Halifax in June 1910 whereas top feed was introduced in 1912 and new cast iron chimneys in 1921.
Superheating of the boiler was first applied to number 3702. Top feed was introduced in 1912 in 1921. Top feed was introduced in new cast iron chimneys in 1921. Number 3702 was Halifax in June 1910.