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Cleaning an engine near the Milwaukee Road roundhouse, Bensenville, Illinois. Milwaukee Road 470 was class L2-b 2-8-2 built by Baldwin in 1923.

 Jack Delano, Library of Congress

Milwaukee Road class L2
The Milwaukee Road class L2 were 2-8-2 or "Mikado"-type steam locomotives built by or for the Chicago, Milwaukee, St. Paul and Pacific Railroad (“The Milwaukee Road”) in the period 1912–1923.

Construction history
Cleaning an engine near the Milwaukee Road roundhouse, Bensenville, Illinois. Milwaukee Road 470 was class L2-b 2-8-2 built by Baldwin in 1923.

There were three sub-classes of the class L2: the L2 proper comprised 40 locomotives, built by Milwaukee Road’s Milwaukee Shops in 1912–13, 115 by Alco’s Brooks Works in 1912, and 25 by Alco’s Schenectady Works in 1914. They were followed by 100 class L2-a built by Baldwin Locomotive Works in 1920, and 100 class L2-b in 1922, also built by Baldwin.

Numbering
L2
When originally built, the Milwaukee Shops locomotives had been allocated 1800–1839, however only the first seven carried these numbered before the allocation became 8000–8039. Similarly, only the first 50 Brooks locomotives received their 1840–1889 numbers, before their allocation was changed to 8040–8154. The Schenectady engines were numbered 8155–8179.

Sixty-nine L2 locomotives received mechanical stokers and were reclassified as class L2-r. At the Milwaukee Road’s 1938 renumbering, the remaining 62 L2-r locomotives were renumbered 600–661, with the remaining 77 non-stoker fitted L2 locomotives receiving numbers 662–738.

L2-a
The 100 L2-a locomotives were built by the Baldwin Locomotive Works as 8200–8299, and became 500–599 in 1938.

L2-b
The 100 L2-b locomotives were built by the Baldwin Locomotive Works as 8300–8399, and became 400–499 in 1938.

Notes
Sadly, none of the mikado's survived to preservation

Milwaukee Road Class L2 Overview
Power type: Steam
Builders: Milwaukee Road (40), American Locomotive Company (140), Baldwin Locomotive Works (200)
Build date:
L2: 1912–1914
L2-a: 1920
L2-b: 1922–1923
Total produced: 380
Specifications
Configuration:
​ • Whyte: 2-8-2
 • UIC: 1′D1′ h2
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter: 63 in (1,600 mm)
Adhesive weight: 216,000–220,000 lb (98–100 tonnes)
Locomotive weight: 275,000–292,770 lb (124.74–132.80 tonnes)
Fuel type: Coal
Firebox:
 • Firegrate area: 49 sq ft (4.6 m2)
Boiler pressure: 200 lbf/in2 (1.38 MPa)
Heating surface: 2,925–3,050 sq ft (271.7–283.4 m2)
Superheater:
​ • Heating area: 640–685 sq ft (59.5–63.6 m2)
Cylinders: Two
Cylinder size: 26 in × 30 in (660 mm × 762 mm)
Valve gear:
L2, L2-b: Walschaerts
L2-a: Baker
Locomotive brake: Air
Train brakes: Air
Performance figures
Tractive effort: 54,720 lbf (243.4 kN)
Career
Operator: Milwaukee Road
Class: L2, L2-a, and L2-b
Number in class
L2: 180
L2-a: 100
L2-b: 100
Road Numbers: 8000–8179, 8200–8399, renumbered 400–738 in 1938
Retired: 1935–1956
Disposition: All scrapped

See also:

2-8-2 Locomotives

Milwaukee Road

Baldwin Locomotive Works

USRA 2-8-2 Light Mikado Locomotive

USRA 2-8-2 Heavy Mikado Locomotive

Steam Locomotives

Baldwin Locomotive Works’ photograph of L2-a No. 8200, later 500, construction no. 53596, Baldwin class 12-46-¼-E, 594; built August 1920, retired March 1953.

Baldwin Locomotive Works’ photograph of L2-a No. 8200, later 500, construction no. 53596, Baldwin class 12-46-¼-E, 594; built August 1920, retired March 1953.
Cleaning an engine near the Milwaukee Road roundhouse, Bensenville, Illinois. Milwaukee Road 470 was class L2-b 2-8-2 built by Baldwin in 1923.
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