The Twin Sisters was an early steam locomotive, built for use during the construction of the Liverpool and Manchester Railway.

The enabling Act of Parliament for the Liverpool and Manchester Railway required that locomotives should not produce smoke.

[2] Although Booth was the company secretary and treasurer of the L&M, he was also an inventive engineer and collaborated closely with the Stephensons, particularly on developments in boilers.

The Travelling Engine was ordered on 7 January 1828 and had only been working for a few months when on 21 April it was decided to transfer it to the Bolton and Leigh Railway, which was to be opened in June.

[10] The intention was to use it to remove spoil from the 70 ft deep Olive Mount cutting to the embankment constructed at Broad Green.

[2] This was the first railway where this was a formal requirement, although experiments had already taken place to reduce the smoke from the boilers of stationary engines.

[iv] A drawback to the use of coke was that the fire required a stronger blast on it, produced either by bellows, a fan or the blastpipe,[11] or in Stephenson's term, the 'exarsting pipe'.

[15] The rest of the design was conventional for a Stephenson locomotive of this time, with a number of features which had first appeared on Lancashire Witch.

[13] In February she was involved in a fatal accident at Liverpool Road station, the Manchester terminus of the line.