LMS Compound 4-4-0

LMS Compound 4-4-0

Infobox Locomotive
name = LMS 4P Compound 4-4-0
powertype = Steam


caption = 41199 at Derby in 1948, recently outshopped with "British Railways" on her tender.
gauge = RailGauge|ussg
builddate = 1924–1932
builder = LMS Derby (75) LMS Horwich (20); North British Locomotive Company (25) Vulcan Foundry (75)
railroad = London, Midland and Scottish Railway British Railways
railroadclass = 4P
weight = "Loco:" convert|61.7|LT|t|lk=on "Tender:" 41.2–41.7 long tons
wheelbase = "Loco:" convert|24.25|ft|m|3|abbr=on
length = convert|56.65625|ft|m|3|abbr=on
boilerpressure = convert|200|psi|MPa|2|abbr=on|lk=on
cylindercount = HP: 1 (inside) LP: 2 (outside)
hpcylindersize = 19×26 in
lpcylindersize = 21×26 in
leadingsize = convert|42.5|in|m|3|abbr=on
boiler = G9AS
firearea = convert|28.5|sqft|m2|abbr=on
tubearea = convert|1170|sqft|m2|abbr=on
superheaterarea = convert|290|sqft|m2|abbr=on or convert|272|sqft|m2|abbr=on
fireboxarea = convert|147|sqft|m2|abbr=on
driversize = convert|81|in|m|3|abbr=on
tractiveeffort = convert|22650|lbf|kN|abbr=on|lk=on
valvegear = Stephenson
tenderc
convert|3500|impgal|l|abbr=on|lk=on "Coal:" 4, 5, or 5.5 long tons
numinclass = 195
roadnumber = LMS 900–939, 1045–1199
retired = 1952–1961
trainbrakes = VacuumThe London, Midland and Scottish Railway Compound 4-4-0 was a class of steam locomotive designed for passenger work.

Overview

One hundred and ninety five engines were built by the LMS, adding to the 45 Midland Railway 1000 Class, to which they were almost identical. The most obvious difference is that the driving wheel diameter was reduced from 7' 0" on the Midland locomotive to 6' 9" on the LMS version.They were given the power classification 4P.

The LMS continued the Midland numbering from 1045 to 1199 and then started in the lower block of 900-39. After nationalisation in 1948, BR added 40000 to their numbers so they became 40900-39 and 41045-199.

None has survived to preservation, though the first of the Midland 1000 Class engines has.

Dimensions

* LMS/BR Power classification, 4P
* Locomotive weight, 61 tons 14 cwt
* Boiler pressure, 200 psi
* Superheater, Yes
* Cylinders:
** One high pressure, 19"x26" (piston valves)
** Two low pressure, 21"x26" (slide valves)
* Driving wheel diameter, 6' 9"
* Tractive effort, 22,650 lb (LP cylinders at 80% pressure)
* Valve gear, Stephenson

For terminology, see Steam locomotive components

ources

* Ian Allan ABC of British Railways Locomotives, 1948 Edition, part 3, pp 5-6

External links

* [http://www.railuk.co.uk/steam/getsteamclass.php?item=4P-A Railuk database]


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