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I suspect the problem with the Bulleid valve gear was just that it was ahead of its time. Judging by the information I found here http://www.semg.org.uk/steam/mn_01.html there was nothing inherently wrong with the design, it just took rather more care and attention than could be provided. <br /> <br />Yellow ends were brought in (if I remember rightly) due to the new diesels being a lot quieter than steam. A steam loco at speed made a lot more noise giving MOW crews time to get off the line, but a diesel could appear with very little warning.
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