 The contracts were for 20 engines each, with rights to a 20-engine extension and the possibility of up to a total of 100 engines.Respectively, Beyer, Peacock and Co. delivered engines 531-569, Baldwin delivered 571-609 and Newport 611-649 (plus tank engine 719) in 1912.The following year saw Walkers delivered 651-689 while Newport supplied tank engines 721-749.