The LCDR Sondes class was a class of six steam locomotives of the 4-4-0ST wheel arrangement. They were designed by Thomas Russell Crampton for the East Kent Railway (EKR) to specifications prepared by Joseph Cubitt. An order was placed in March 1857 with R. & W. Hawthorn & Co. for six locomotives at £2,700 each; they were delivered to the EKR between November 1857 and March 1858. The first section of the EKR opened on 25 January 1858; and the EKR became the London, Chatham and Dover Railway (LCDR) in 1859.