1851 Great Exhibition: Official Catalogue: Class V.: Thomas R. Crampton
From Graces Guide
508. CRAMPTON, THOMAS R., South Eastern Railway Company, 15 Buckingham Street, Adelphi.
South Eastern Railway Company's London and Paris express locomotive engine, the "Folkestone," Crampton's patent.
[This engine is suspended from three points at the ends of the machine, the object being to insure the weights on the wheels being at all times the same, and thus producing the greatest amount of steadiness. Attention is also called to the fact that the whole of the machinery is independent of the road: it is thus similar in its action to a fixed engine, and the risk of breaking the crank axle, which frequently occurs in inside cylinder engines, is considered to be thus avoided.]