USRA Heavy Mikado

USRA Heavy Mikado

Infobox Locomotive
name = USRA Heavy Mikado
powertype = Steam


whytetype = 2-8-2
uicclass = 1'D1'
builddate = 1918–?
builder = ALCO, Baldwin, Lima
totalproduction = 233 originals, plus 724 copies
driversize = convert|63|in|m|2|abbr=on
wheelbase = convert|36|ft|1|in|m|2|abbr=on (locomotive only)
cylindercount = 2
cylindersize = convert|27|in|mm|abbr=on bore × convert|32|in|mm|abbr=on stroke
boilerpressure = convert|190|psi|kPa|abbr=on
firearea = convert|70.8|sqft|m2|abbr=on
valvegear = Walschaerts
tractiveeffort = convert|60000|lb|kN|abbr=on

The USRA Heavy Mikado was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. These locomotives were of 2-8-2 wheel arrangement in the Whyte notation, or 1'D1' in UIC classification. A total of 233 locomotives were built to this plan for the USRA; postwar, it became a de facto standard design, which was built to the total of 957 locomotives including the USRA originals and all subsequent copies.cite book
title = Uncle Sam's Locomotives: The USRA and the Nation's Railroads
author = Huddleston, Eugene L.
year = 2002
publisher = Indiana University Press
location = Bloomington, Indiana
id = ISBN 0-253-34086-1]

They used the same running gear as the USRA Light Mikado but were built to a higher axle load, larger cylinders and a much larger boiler for more power and steam-generating ability. Many aspects of the PRR L1s class were carried over to the Heavy Mikado, although not that locomotive's distinctive Belpaire firebox.cite book |title =Model Railroader Cyclopedia volume 1 Steam Locomotives| author= Westcott, Linn H. |year=1960 |publisher=Kalmbach Publishing Co. |location=Milwaukee, Wis. |id=ISBN 0890240019]


=Original owners=

USRA originals

* Central Railroad of New Jersey (10)
* Chicago, Burlington & Quincy Railroad (15)
** Fort Worth and Denver Railroad (5)
* El Paso and Southwestern Railroad (5) — to Great Northern Railway in 1920
* Elgin, Joliet and Eastern Railway (5) — to Western Pacific Railroad
* Erie Railroad (15)
* Great Northern Railway (4) O-3 class
* Louisville and Nashville Railroad (20)
* Chicago, Milwaukee, St. Paul and Pacific Railroad ("Milwaukee Road") (100) class L3
* Chicago, St. Paul, Minneapolis and Omaha Railway ("Omaha Road") (4)
* Pittsburgh and Lake Erie Railroad (15)
* Pittsburgh, McKeesport and Youghiogheny Railroad (15)
* Wheeling and Lake Erie Railroad (20)

Copies

* Atlanta and West Point Rail Road (1) class F
* Chicago, Indianapolis and Louisville Railroad ("Monon")
* Missouri Pacific Railroad
** St. Louis, Brownsville and Mexico Railway
* New York, Chicago & St. Louis Railroad ("Nickel Plate Road")
* Pittsburgh and West Virginia Railway
* St. Louis-San Francisco Railway (65)
* Southern Railway
** Alabama Great Southern Railroad
** Cincinnati, New Orleans and Texas Pacific Railroad
* Western Railway of Alabama (1) class F

References


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