Thuile proposed a 6-4-8 or 6-4-6 locomotive with 3-metre-diameter (9 ft 10 in) driving wheels, but it was not built.

[1] The design was taken up by Schneider, of Le Creusot, who built a 4-4-6 with 2.5-metre-diameter (8 ft 2 in) driving wheels, and a forward cab for the driver.

The two-cylinder locomotive had Walschaerts valve gear and a double-lobed boiler of nickel-steel.

A speed of 117 kilometres per hour (73 mph) was attained hauling a load of 186 tonnes (183 long tons).

[1] The trials ended when Thuile was killed in June 1900, apparently because he leant too far out of the locomotive and hit a lineside pole[2] or a piece of scaffolding supporting an overbridge.