British Rail Class 11

Infobox Locomotive
name = British Rail Class 11
powertype = Diesel-electric


caption =
builder = LMS/BR Derby & BR Darlington
builddate = 1945–1952
roadnumber = WD: 70260–70273
LMS: 7120–7129
BR: 12033–12138
totalproduction = 120
numinclass = WD: 14 (10 to NS)
LMS/BR: 106
gauge = RailGauge|ussg|lk=on|al=on
primemover = English Electric 6KT
cylindercount = Straight 6
transmission = DC generator, DC traction motors, double reduction gearing
tractionmotors = English Electric 506, 2 off
generator = English Electric 801 — 441 A, 430 V
whytetype = 0-6-0
uicclass = C
wheeldiameter = convert|4|ft|0+1/2|in|m|3|abbr=on
minimumcurve = convert|3.5|chain|m|lk=on
trainbrakes = Vacuum
locobrakeforce = convert|32.2|LTf|sigfig=3|abbr=on|lk=in
wheelbase = convert|11|ft|6|in|m|2|abbr=on
length = convert|29|ft|1+1/2|in|m|2|abbr=on
width = convert|8|ft|5|in|m|2|abbr=on
height = convert|12|ft|5+1/2|in|m|2|abbr=on
weight = convert|47.4|LT|sigfig=3|lk=on
topspeed = convert|20|mph|km/h|abbr=on|lk=on
poweroutput = "Engine:" convert|350|hp|0|abbr=on|lk=on
tractiveeffort = "Maximum:" convert|34900|lbf|kN|1|abbr=on|lk=on
fuelc
convert|660|impgal|abbr=on|lk=on
axleloadclass = RA 5
trainheating = None
multipleworking = Not fitted
railroad = War Department
Nederlandse Spoorwegen (NS)
London, Midland and Scottish Railway
British Railways
HNRC
heritage railwaysThe British Rail Class 11 was applied to a batch of diesel shunting locomotives built from April 1945 to December 1952, based on a similar earlier batch built by the London, Midland and Scottish Railway (LMS) between 1939 and 1942.

Overview

Numbering

The fourteen locomotives were built for War Department, with the first ten subsequently going the Nederlandse Spoorwegen as NS 50–501). LMS numbers 7120-7129 went straight into LMS stock, with 7129 being the last diesel shunter to be built for the LMS. British Railways continued to build the class from 1948-1952, being numbered M7130–M7131 and 12045-12138. 7120-7129 and M7130–M7131 became BR numbers 12033-12044. The whole class of 12033-12138 became Class 11. Locomotives up to 12102 were built at LMS/BR Derby and 12103-12138 at BR Darlington.

Export locomotives

Close to 100 almost identical machines were built by English Electric & supplied to the Nederlandse Spoorwegen (NS) as their 500 Class & 600 Class diesel locomotives. Sixty-five of the 600 Class locomotives were built, numbered 601-665. They were built by English Electric between 1950-1957 at either Dick, Kerr & Co. Works (601-610) in Preston, or Vulcan Foundry Works (rest) in Newton-le-Willows.

Another export order was to Australia, with 16 locomotives built for use on 5'3" broad gauge in 1951. Victorian Railways bought 10 as the F class, while 6 were bought by the State Electricity Commission of Victoria. [cite web
url=http://www.victorianrailways.net/motive%20power/fdie/fdie.html
title=F class d/e locomotives
publisher=www.victorianrailways.net
accessdate=2008-08-10]

Technical details

The diesel engine is an English Electric 6-cylinder, 10 in bore by 12 in stroke (254 by 305 mm); 4-stroke, 6KT and the traction motors are 2 x EE506 axle-hung, nose-suspended, force-ventilated traction motors with 21.7:1 double reduction gear drive. The main generator is an English Electric EE801, 441 A at 430 V.

Post-BR use

The following locomotives are, or were, at Harry Needle Railroad Company (HNRC):

* 12074 Scrapped
* 12082 Operational. It has been re-registered as 01553, in TOPS Class 01/5. It carries both numbers
* 12088 Operational
* 12098 Scrapped

Preservation

The following Class 11 diesel shunters are preserved:

*12049 at Watercress Line [http://www.preservedshunters.co.uk/psh_shunter.php?class=11&loco=12049]
*12052 at Caledonian Railway (Brechin)
*12061 by Heritage Shunters Trust
*12077 at Midland Railway, Butterley
*12083 at Battlefield Line Railway
*12093 at Caledonian Railway (Brechin)
*12099 at Severn Valley Railway
*12131 at North Norfolk Railway

References