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Thomas Kirtley and Company of Dallam Foundry, Warrington.
1837-41 Built main line railway locomotives under William Kirtley. J. W. Lowe notes that the full extent of their output is not known, but lists 5 locos for the Leipzig & Dresden Railway in 1837-8, 9 for the Leeds and Selby Railway in 1839-40, and one for the Stockton and Darlington Railway in 1841.
1838 Partnership dissolved between Thomas Kirtley and George Stubs, locomotive engine makers, Warrington, 18th July - Debts by Kirtley. 
1843 Equipment and property of Dallam Foundry advertised for sale
1848 'TO BE SOLD by Private Contract, the BUILDINGS and PREMISES, in Dallam-lane, Warrington, formerly used as a Locomotive Engine Manufactory, and occupied by Messrs. Thomas Kirtley and Co.; and now used as a Pottery, and occupied by Mr. Thomas Bradford. The Premises were built and are admirably adapted for a Locomotive Manufactory, but may be easily converted to almost any Manufacturing purpose. They contain, with the sites of Buildings, 4175 square yards, and are most conveniently situated, abutting upon, and communicating with the London and North Western Railway. The Tenure is Leasehold for long term, subject to a ground rent of £20 per annum.- Immediate possession may be had if required. For further particulars apply to Messrs. BEAMONT and URMSON, Solicitors, Warrington.'