In 1912 and 1913, the shops built forty more 2-8-2s. This group was designated as Class L-2 and assigned numbers 8000 through 8039. They were similar to the Class L-I "Mikados" except the cylinder diameter was 26 inches, which raised the tractive effort to 54,725 pounds. During 1912 the CMStP&P had the American Locomotive Company build 115 of the Class L-2 locomotives and assigned them road numbers 8040 through 8154 and in 1914, ordered another twenty-five from ALCO, which were delivered the same year and given road numbers 8155 through 8179. The class L-2 locomotives had 63" diameter drivers, 26" x 30" cylinders, a 200 psi boiler pressure and they exerted 54,725 pounds of tractive effort and each weighed 275,000 pounds. The firebox was 258 square feet and the evaporative heating surface was 3,050 square feet and with the superheater the combined heating surface was 3,690 square feet..
In 1918 and 1919, the USRA assigned 100 USRA "Mikado-Heavy" type locomotives to the CMStP&P. This was in fact 43% of this type of locomotive assigned by the USRA. These locomotives were assigned road numbers 8600 through 8699 and were designated as Class L-3. The Class L-3 locomotives had 63" diameter drivers, 27" x 32" cylinders, a 190 psi boiler pressure and they exerted 59,800 pounds of tractive effort and each weighed 325,000 pounds.
The USRA "Mikado-Heavy" Class L-3 locomotives did well on the CMStP&P, but after the War 200 more "Mikados" were ordered from the Baldwin Locomotive Works. These locomotives were very close copies of the Class L-2. Baldwin delivered 100 between 1920 and 1921 and they were assigned road numbers 8200 through 8299 and Baldwin delivered another 100 between 1922 and 1923 and these were given numbers 8300 through 8399. The Class L-2
There are no surviving Milwaukee Road 2-8-2 "Mikado" type locomotives.
Class | Qty. | Road Numbers | Later Numbers | Year Built | Builder | Notes |
---|---|---|---|---|---|---|
L1 | 20 | 8500-8519 | 750-769 | 1909 | CMSt.P&P | scrapped between 1945 and 1954 |
L2 | 40 | 8000-8039 | 600-682 | 1912-1913 | CMSt.P&P | scrapped between 1930 and 1955 |
L2 | 115 | 8040-8154 | 612-726 | 1912 | ALCO | scrapped between 1934 and 1954 |
L2 | 25 | 8155-8179 | 661-738 | 1914 | ALCO | scrapped between 1935 and 1954 |
L3 | 100 | 8600-8699 | 300-399 | 1918-1919 | ALCO | USRA allocated "Mikado-Heavy" locomotives. All scrapped between 1938 and 1956. |
L2 | 100 | 8200-8299 | 500-598 | 1920-1921 | Baldwin | scrapped between 1935 and 1954 |
L2 | 100 | 8300-8399 | 400-499 | 1922-1923 | Baldwin | scrapped between 1950 and 1956 |
Data from MILWRD 1930ca locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also Jim Scribbins, "Chicago, Milwaukee, St Paul & Pacific (Milwaukee Road) in George H Drury, Guide to North American Steam Locomotives (rev ed.) (Waukesha, WI: Kalmbach Books, 2015), p.134.
These were, according to Jim Scribbins, "basically enlarged Prairies [2-6-2].". 65 sq ft (6.04 sq m) of direct heating surface came from the combustion chamber. On the one hand, being delivered with a saturated boiler puts them in the first period of Mikado development, but rolling on 63" drivers and adding a combustion chamber point toward futher 2- 8- 2 developments. The shops later fitted some of the class with superheaters. Only four L1s went to the scrapper before the US entered World War II. Ten of the remaning 16 remained in service in to the 1950s.Data from Milwrd 1930ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
According to Jim Scribbins writing in Drury (1993), this Mikado design suited the Chicago, Milwaukee, St Paul & Pacific's requirements very well. The Milwaukee shops built 40 in their shops and bought 180 (155 from Brooks in 1912 and 25 from Schenectady in 1914). After World War I, Baldwin supplied 200 more in 1920-1923 to slightly different designs; see Locobases 15196 and 15197. Locobase doesn't know why the class began retiring as early as the 1930s, but can tell that some carried on to the end of steam.Data from DeGolyer Library, Vol 67, pp. 199. Works numbers were:
1920 August 53596; September 53624-53625, 53658-53660, 53678-53680, 53708-53711, 53754-53756 October 53819-53821, 53839-53843, 53867, 53913-53917 November 53937-53939, 53970-53973, 54000, 54036-54044, 54093-54097, 54099, 54120, 54125- 54127, 54144-54151 December 54152-54160, 54192-54194, 54197 1921 January 54287-54289, 54315-54320, 54348-54359 February 54542 When the Milwaukee decided to increase its Mikado motive power stock six years after building its own and buying from Alco (Locobase 1191), it went to Eddystone. The design had the same power dimensions and weighed about the same. Piston valves still measured 14" (356 mm) in diameter and the firebox still had 26 sq ft (2.4 sq m) of arch tubes. Also the boiler's distribution of tubes and flues was unchanged. But the valves were actuated by Baker-Pilliod's radial gear, the grate area grew a bit due a slightly longer grate, the combustion chamber gained four inches (102 mm) and increased its contribution to heating surface area to 65 sq ft (6.05 sq m). It was delivered with a Duplex automatic stoker. A "Hereafter" note from 24 April 1924 stating that that "No welding whatever will be permitted on forgings" suggests some in-service incidents that ended badly. Well-suited to the Milwaukee's demands, as were all of the L2s, all but a few L2-as served into the 1950s. The 8280 was withdrawn in July 1935 and 8289 was retired in March 1944. Of the rest, several were retired in late 1949, the bulk in 1950-1953, and the last few in December 1954.Data from DeGolyer Library, Vol 67, pp. 211. Works numbers were:
1922 May 55383-55387 July 55541-55542 September 55605-55616, 55663-55668 1923 May 56518-56523, 56577-56586 June 56686-56693 July 56759-56765, 56831-56836 August 56907-56911, 56984-56991 September 57062-57066, 57082-57083, 57171-57181 October 57249-57252, 57265-57365 Locobase had detected a relative insufficiency in superheater heating surface area compared to many other Mikados of the period and apparently so did the Milwaukee some 90 years earlier. The last L2s they procured came from Baldwin (as had the L2a shown in Locobase 15196), but these had boiler changes aimed at remedying that shortcoming. Like all of the Milwaukee's L2s, this class of -bs satisfied Milwaukee Road requirements for decades and all operated into the 1950s. The first to retire was withdrawn in January 1950, the last nineteen were withdrawn as a group six years later in January 1956.Data from MILWRD 1945 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange collection. See also Jim Scribbins, "Chicago, Milwaukee, St Paul & Pacific (Milwaukee Road)" in George H Drury, Guide to North American Steam Locomotives, Revised Edition (Waukesha, WI: Kalmbach Books, 2015), p. 134.
(Thanks to John Werth for his 24 July 2021 email noting the Wilson feed water heater.) for the Wilson system: "Milwaukee's S2's: Any Milwaukee Steam Experts Out Ther[e?]" thread begun by rcall30160 [Bob Callahan] on 4 June 2010 and Larry Doyle's response on 5 June 2010 on the trainorders forum at [
Principal Dimensions by Steve Llanso of Sweat House Media | |||||
---|---|---|---|---|---|
Class | L1 | L2 | L2-a | L2-b | L3, L3-a, b (USRA) |
Locobase ID | 1192 | 1191 | 15196 | 15197 | 16522 |
Railroad | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) |
Country | USA | USA | USA | USA | USA |
Whyte | 2-8-2 | 2-8-2 | 2-8-2 | 2-8-2 | 2-8-2 |
Number in Class | 20 | 180 | 100 | 100 | 100 |
Road Numbers | 2500-2519/8500-8519/750-767 | 8000-8179 | 8200-8299 / 500-598 | 8300-8399 | 8600-8699/300-399 |
Gauge | Std | Std | Std | Std | Std |
Number Built | 20 | 180 | 100 | 100 | 100 |
Builder | Milwaukee | several | Baldwin | Baldwin | Alco - multiple works |
Year | 1909 | 1912 | 1920 | 1922 | 1918 |
Valve Gear | Walschaert | Walschaert | Baker | Walschaert | Walschaert |
Locomotive Length and Weight | |||||
Driver Wheelbase (ft / m) | 16.50 / 5.03 | 16.50 / 5.03 | 16.50 / 5.03 | 16.50 / 5.03 | 16.75 / 5.11 |
Engine Wheelbase (ft / m) | 35.08 / 10.69 | 35.08 / 10.69 | 35.25 / 10.74 | 35.25 / 10.74 | 36.10 / 11 |
Ratio of driving wheelbase to overall engine wheelbase | 0.47 | 0.47 | 0.47 | 0.47 | 0.46 |
Overall Wheelbase (engine & tender) (ft / m) | 65.60 / 19.99 | 66.69 / 20.33 | 66.69 / 20.33 | 70.54 / 21.50 | 72.17 / 22 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 56,300 / 25,537 | ||||
Weight on Drivers (lbs / kg) | 201,000 / 91,172 | 216,500 / 98,203 | 219,000 / 99,337 | 219,000 / 99,337 | 243,000 / 110,223 |
Engine Weight (lbs / kg) | 260,500 / 118,161 | 275,000 / 124,738 | 289,000 / 131,088 | 289,000 / 131,088 | 320,000 / 145,150 |
Tender Loaded Weight (lbs / kg) | 154,000 / 69,853 | 156,000 / 70,760 | 155,000 / 70,307 | 180,000 / 81,647 | 183,800 / 83,370 |
Total Engine and Tender Weight (lbs / kg) | 414,500 / 188,014 | 431,000 / 195,498 | 444,000 / 201,395 | 469,000 / 212,735 | 503,800 / 228,520 |
Tender Water Capacity (gals / ML) | 8000 / 30.30 | 8500 / 32.20 | 8500 / 32.20 | 10,000 / 37.88 | 10,000 / 37.88 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 14 / 13 | 11 / 10 | 12 / 11 | 16 / 15 | 16 / 15 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 84 / 42 | 90 / 45 | 91 / 45.50 | 91 / 45.50 | 101 / 50.50 |
Geometry Relating to Tractive Effort | |||||
Driver Diameter (in / mm) | 63 / 1600 | 63 / 1600 | 63 / 1600 | 63 / 1600 | 63 / 1600 |
Boiler Pressure (psi / kPa) | 200 / 13.80 | 200 / 13.80 | 200 / 13.80 | 200 / 13.80 | 190 / 13.10 |
High Pressure Cylinders (dia x stroke) (in / mm) | 24" x 30" / 610x762 | 26" x 30" / 660x762 | 26" x 30" / 660x762 | 26" x 30" / 660x762 | 27" x 32" / 686x813 |
Tractive Effort (lbs / kg) | 46,629 / 21150.58 | 54,724 / 24822.42 | 54,724 / 24822.42 | 54,724 / 24822.42 | 59,801 / 27125.31 |
Booster (lbs) | 11,520 | ||||
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.31 | 3.96 | 4.00 | 4.00 | 4.06 |
Heating Ability | |||||
Tubes (number - dia) (in / mm) | 366 - 2" / 51 | 226 - 2" / 51 | 226 - 2" / 51 | 198 - 2" / 51 | 243 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 30 - 5.375" / 137 | 30 - 5.375" / 137 | 34 - 5.375" / 137 | 45 - 5.5" / 140 | |
Flue/Tube length (ft / m) | 17.52 / 5.34 | 17.51 / 5.18 | 17.50 / 5.33 | 17.50 / 5.33 | 19 / 5.79 |
Firebox Area (sq ft / m2) | 282 / 26.21 | 258 / 23.98 | 310 / 28.80 | 311 / 28.89 | 316 / 29.36 |
Grate Area (sq ft / m2) | 48.80 / 4.54 | 48.80 / 4.54 | 49.12 / 4.56 | 48.80 / 4.53 | 70.50 / 6.55 |
Evaporative Heating Surface (sq ft / m2) | 3614 / 335.87 | 3050 / 283.46 | 3106 / 288.55 | 2950 / 274.06 | 4314 / 400.78 |
Superheating Surface (sq ft / m2) | 640 / 59.48 | 645 / 59.92 | 720 / 66.89 | 993 / 92.25 | |
Combined Heating Surface (sq ft / m2) | 3614 / 335.87 | 3690 / 342.94 | 3751 / 348.47 | 3670 / 340.95 | 5307 / 493.03 |
Evaporative Heating Surface/Cylinder Volume | 230.04 | 165.40 | 168.44 | 159.98 | 203.39 |
Computations Relating to Power Output (More Information) | |||||
Robert LeMassena's Power Computation | 9760 | 9760 | 9824 | 9760 | 13,395 |
Same as above plus superheater percentage | 9760 | 11,419 | 11,494 | 11,712 | 15,940 |
Same as above but substitute firebox area for grate area | 56,400 | 60,372 | 72,540 | 74,640 | 71,448 |
Power L1 | 6716 | 11,502 | 11,913 | 12,510 | 13,950 |
Power MT | 294.65 | 468.50 | 479.70 | 503.74 | 506.25 |