| 释义 |
- Withdrawal
- Technical comparison
- References
{{Use dmy dates|date=January 2017}}{{Use British English|date=January 2017}}The London, Midland and Scottish Railway and British Railways Class 4 2-6-4T was a family of classes of steam locomotives. A grand total of 800 engines were built to five separate designs by four different mechanical engineers, over a period of 29 years. Each new design was a development of the previous one. The LMS gave the whole family the power classification 4P, BR 4MT. It is therefore worth considering them as a group as follows: | LMS Nos | BR Nos | Design | Designer | Built | Built by LMS | Built by BR | Total built | | 2300–2424 | 42300–42424 | Fowler | Henry Fowler | 1927–1934 | 125 | 0 | 125 | | 2500–2536 | 42500–42536 | Stanier, 3 cylinder | William Stanier | 1934 | 37 | 0 | 37 | | 2425–2494, 2537–2672 | 42425–42494, 42537–42672 | Stanier, 2 cylinder | William Stanier | 1935–1943 | 206 | 0 | 206 | | 2187–2299, 2673–2699 | 42050–42299, 42673–42699 | Fairburn | Charles Fairburn | 1945–1951 | 130 | 147 | 277 | | — | 80000–80154 | BR Standard | Robert Riddles | 1951–1956 | 0 | 155 | 155 | | Total | 1927–1956 | 498 | 302 | 800 |
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Withdrawal All engines were withdrawn from stock between 1959 and 1967, summarised as follows: Locomotives withdrawn by year| Year | Fowler | Stanier,
3-cylinder | Stanier,
2-cylinder | Fairburn | BR
Standard | Total | | 1959 | 5 | 0 | 0 | 0 | 0 | 5 | | 1960 | 11 | 1 | 2 | 0 | 0 | 14 | | 1961 | 22 | 7 | 17 | 3 | 0 | 49 | | 1962 | 37 | 29 | 43 | 43 | 1 | 153 | | 1963 | 16 | 0 | 29 | 30 | 0 | 75 | | 1964 | 20 | 0 | 51 | 57 | 31 | 159 | | 1965 | 12 | 0 | 38 | 54 | 44 | 148 | | 1966 | 2 | 0 | 11 | 48 | 54 | 115 | | 1967 | 0 | 0 | 15 | 42 | 25 | 82 | | Total | 125 | 37 | 206 | 277 | 155 | 800 |
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Locomotives in service at year end| Year | Fowler | Stanier,
3-cylinder | Stanier,
2-cylinder | Fairburn | BR
Standard | Total | | 1958 | 125 | 37 | 206 | 277 | 155 | 800 | | 1959 | 120 | 37 | 206 | 277 | 155 | 795 | | 1960 | 109 | 36 | 204 | 277 | 155 | 781 | | 1961 | 87 | 29 | 187 | 274 | 155 | 732 | | 1962 | 50 | 0 | 144 | 231 | 154 | 579 | | 1963 | 34 | 0 | 115 | 201 | 154 | 504 | | 1964 | 14 | 0 | 64 | 144 | 123 | 345 | | 1965 | 2 | 0 | 26 | 90 | 79 | 197 | | 1966 | 0 | 0 | 15 | 42 | 25 | 82 | | 1967 | 0 | 0 | 0 | 0 | 0 | 0 | Technical comparison For technical purposes, it is worth splitting the Fairburn tanks into two subclasses; early (42050–42146) and late (42147–42699) as their weights differ slightly. | Attribute | Fowler | Stanier, 3 cylinder | Stanier, 2 cylinder | Fairburn (early)[1] | Fairburn (late)[2] | BR Standard | | Leading wheel diameter | {{convert|3|ft|3+1/2|in|m|3|abbr=on}} | 3|ft|0|in|m|3|abbr=on}} |
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| Driving wheel diameter | {{convert|5|ft|9|in|m|3|abbr=on}} | 5|ft|8|in|m|3|abbr=on}} |
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| Trailing wheel diameter | {{convert|3|ft|3+1/2|in|m|3|abbr=on}} | 3|ft|0|in|m|3|abbr=on}} |
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| Wheelbase | {{convert|38|ft|6|in|m|2|abbr=on}} | {{convert|37|ft|1|in|m|2|abbr=on}} | 36|ft|10|in|m|2|abbr=on}} |
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| Length | {{convert|47|ft|2+3/4|in|m|2|abbr=on}} | {{convert|45|ft|9+3/4|in|m|2|abbr=on}} | 44|ft|9+7/8|in|m|2|abbr=on}} |
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| Weight | 86.25|LT|t|2|abbr=on}} | 92.25|LT|t|2|abbr=on}} | 87.75|LT|t|2|abbr=on}} | 85.25|LT|t|2|abbr=on}} | 84.70|LT|t|2|abbr=on}} | 86.50|LT|t|2|abbr=on}} |
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| Axleload | 17.95|LT|t|2|abbr=on}} |
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| Coal capacity | {{convert|3.50|LT|t|2|abbr=on}} |
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| Water capacity | {{convert|2000|impgal|l|-2|abbr=on}} | 1875|impgal|l|-2|abbr=on}} | 2000|impgal|l|-2|abbr=on}} |
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| Boiler | G8AS | 4C | ABR5 |
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| Boiler pressure | 200|psi|MPa|2|abbr=on}} | {{convert|200|psi|MPa|2|abbr=on}} | 225|psi|MPa|2|abbr=on}} |
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| Firegrate area | 25|sqft|m2|abbr=on}} | {{convert|25|sqft|m2|abbr=on}} | 26.7|sqft|m2|abbr=on}} |
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| Heating surface: Tubes | 1082|sqft|m2|abbr=on}} | {{convert|1011|sqft|m2|abbr=on}} | 1223|sqft|m2|abbr=on}} |
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| Heating surface: Firebox | 138|sqft|m2|abbr=on}} | {{convert|137|sqft|m2|abbr=on}} | 143|sqft|m2|abbr=on}} |
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| Superheater area | 266 sq ft / 246 sq ft | 160 sq ft/154 sq ft | 240|sqft|m2|abbr=on}} |
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| Cylinders | 2 outside | 3 | 2 outside | 2 outside | 2 outside | 2 outside |
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| Cylinder size | 19|x|26|in|mm|0|abbr=on}} | 16|x|26|in|mm|0|abbr=on}} | {{convert|19.625|x|26|in|mm|0|abbr=on}} | 18|x|28|in|mm|0|abbr=on}} |
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| Tractive effort | 23125|lbf|kN|2|abbr=on}} | 24598|lbf|kN|2|abbr=on}} | {{convert|24671|lbf|kN|2|abbr=on}} | 25515|lbf|kN|2|abbr=on}} |
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1. ^Derby Lots 177, 185, 186, and 196: locomotives 42147–42699, built 1945–1949
2. ^Derby Lots 202, 210, and all Brighton-built locomotives: numbers 42050–42146, built 1948–1951
References{{reflist}}- {{cite book |last=Bradley |first=Roger P. |year=1984 |title=The Standard Steam Locomotives of British Railways |location= |publisher=David & Charles |isbn= |ref=harv}}
- {{Rowledge-Engines of the LMS|pages=5–7, 42–44, 51–52}}
{{DEFAULTSORT:LMS BR Class 4 2-6-4T locomotives}} 3 : London, Midland and Scottish Railway locomotives|2-6-4T locomotives|Railway locomotives introduced in 1927 |