Jones, Turner and Evans was a locomotive manufacturer in Newton-le-Willows, England from 1837, known as Jones and Potts between 1844 and 1852.
The company opened in 1837 with subcontracts from Edward Bury and Robert Stephenson. They provided locomotives for the North Union Railway and the Midland Counties Railway, the latter all 2-2-2 with 5 ft 6 in (1.68 m) diameter driving wheels, and 12 in × 18 in (300 mm × 460 mm) cylinders. In 1840, they built two four-coupled 0-4-2s for the MCR. Further orders included engines for the Great Northern Railway, London and Brighton Railway and the Grand Junction Railway. They also supplied six broad gauge engines for the Great Western Railway, the first of the class being Firefly. In 1841 built four for the Eastern Counties Railway. Also in 1841 they exported two 0-4-2 locomotives to Austria: Minotaurus and Ajax. Ajax is now the oldest preserved steam locomotive in mainland Europe. It was built for the inauguration of the Kaiser Ferdinands-Nordbahn in 1837. Originally built to transport goods it was, due to its large wheels and capability for high speeds, used for passenger services also. In 1874 it was withdrawn from service but not scrapped. From 1897 Ajax' was stored at the Austrian Railway Museum. In 1908 on the occasion of the 70th anniversary of the Kaiser Ferdinands-Nordbahn it was restored and shortly afterwards transferred to the Techisches Museum in Vienna, where it is still on display.