The construction of the new class was contracted out by the LSWR to Beyer, Peacock & Co., who built 12 4-4-0 tank locomotives in 1879.
The construction of the 46 Class was contracted out by the LSWR in order to speed construction and delivery. The contractor selected was Beyer, Peacock & Co., which manufactured 12 4-4-0 tank locomotives in 1879.