The rate of progress led to quite a rapid turnover in the operating roster. Writing in 1835, Count de Pambour found that of the L&MR's then thirty engines, ten were seen as obsolete and day-to-day work was concentrated on only ten or eleven of the remainder, the remaining third being under repair or kept as backup.[1] By 1840 only ten remained of the first 32 engines; and of a list of engines in use in 1844, fewer than half were even five years old.[2]
Locomotives were often also substantially rebuilt. According to de Pambour again, observing the railway in 1834,
"... what is meant by repairs to the engines is nothing less than their complete re-construction; that is to say that when an engine requires any repair, unless it is for some trifling accident, it is taken to pieces and a new one is constructed, which receives the same name as the first, and in the construction of which are made to serve all such parts of the old engine as are still capable of being used with advantage. The consequence of this is that a reconstructed or repaired engine is literally a new one. The repairs amount thus to considerable sums, but they include also the renewal of the engines."[3]
[6] Participated in Opening Ceremony, driven by Joseph Locke[7] Sold to Lord Carlisle, donated to Patent Office Museum in 1862. Preserved. Contrary to popular belief, George Stephenson had nothing to do with the design or building of this locomotive.[8]
[9] Participated in Opening Ceremony, driven by Frederick Swanwick.[7] Had previously pulled the first full Directors' run, from Liverpool to Manchester and back, on 14 June 1830.
[10] Between Jan 1832 and Mar 1834 Liver worked a greater mileage than any other locomotive.[13] In trials against Planet in June 1832 Liver was found to be more economical; but there were no further orders.[14]
"... about one-third are useless. They are the most ancient, which, having been constructed at the first establishment of the railway, at a time when the company had not yet obtained sufficient experience in that respect, are found now to be out of proportion with the work required of them. The engines actually in daily activity on the road amount to about 10 or 11, and with an equal number in repair or reserve that business might completely be ensured. This is in fact what happens at present, the surplus, above that number being nearly abandoned."
^"Work done by the ten best engines of the Liverpool and Manchester Railway, during the years 1831, 1832, 1833 and the first twelve weeks of 1834", from François Marie Guyonneau de Pambour (1836), A practical treatise on locomotive engines upon railways, pp 336–338; quoted in Mechanics Magazine, 25, 292 (1836), and elsewhere.
^Thomas, R.H.G. (1980). The Liverpool & Manchester Railway. London: Batsford. ISBN0-7134-0537-6.
Addyman, John; Haworth, Victoria (2005). Robert Stephenson: Railway Engineer. England: North Eastern Railway Association and The Robert Stephenson Trust. p. 38. ISBN978-1-873513-60-6.
Baxter, Bertram (1978). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2A: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. pp. 12–17. ISBN0-903485-51-6.
Dendy Marshall, C. F. (1921). "The Liverpool and Manchester Railway". Transactions of the Newcomen Society. 2 (12–44): 22–23.
Marshall, John (1978). A Biographical Dictionary of Railway Engineers. Newton Abbot, England: David and Charles. ISBN0-7153-7489-3.