Experiment was a steam locomotive designed and built by Richard Roberts in 1833 for the Liverpool and Manchester Railway (L&MR).

L&MR No.32[1] Experiment was built in 1833 with vertical cylinders mounted just behind the chimney, driving the wheels via a bell crank.

[2] Another reason that the locomotive was not successful was steam leakage from the cylinders.

[2] Three similar locomotives were built for the Dublin and Kingstown Railway.

[1] Locomotives to this design were built for the Dundee and Newtyle Railway, but they were soon altered.