Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Four examples of class designed by Patrick Stirling were built for the GSWR by R and W Hawthorn between April and August 1855. Little is known about the class which is variously described as having a "dummy crank" or a "crank axle."
Withdrawal
The members of the class were apparently not successful, and all were withdrawn by James Stirling during 1866 and 1867.
Baxter, Bertram (1977). Baxter, David (ed.). British locomotive catalogue 1825-1923, volume 1: General Summary; Index of Locomotive-Owning Companies. Buxton: Moorland Publishing. ISBN0-903485-50-8. LCCN78322204. OCLC60034555. OL4294329M.
Baxter, Bertram (1984). Baxter, David (ed.). British locomotive catalogue 1825-1923, volume 4: Scottish and remaining English Companies in the LMS Group. Buxton: Moorland Publishing. ISBN0-903485-53-2. OCLC59913101. OL25432141M.