The term “Lancing Singles” most specifically refers to two 2-2-2 locomotives designed by Craven and built for the LB&SCR in 1861, but also to a third one that had already been built in 1858 and was largely similar. All had outside sandwich frames and inside iron plate frames. All three axles were mounted in the outside frames, but the driving axle had additional bearings in the inside frames. The diameter of the driving wheels of all locomotives was six and a half feet or 1,981 mm. All had double fireboxes which were separated by a water jacket.

No. 132 built in December 1858 received no name and had cylinders of 16 by 22 inches. The other two, Numbers 146 and 147, were completed in July 1861. They received the names “Lancing” and “Worthing”. Apart from being heavier than 132, they had a slightly longer wheelbase and a cylinder diameter of 17 inches. The drawing of 146 shows a steam tube that runs from the smoke box to the trailing end of the locomotive. It was used to heat the feed water with exhaust steam. No. 132 was withdrawn in August 1875, the other two only followed in April 1886.