The first "Mikado" type locomotives on the Chicago & Alton arrived from the American Locomotives Company in 1910. These first 2-8-2s were delivered in two batched with the first designated as Class L-1 and given road numbers 800 through 809 and the second designated as Class L-1a had road numbers 810 through 829 assigned. These thirty locomotives had 62" diameter drivers, 26" x 30" cylinders, a 170 psi boiler pressure and they exerted 47,265 pounds of tractive effort. The Class L1 locomotives weighed 269,000 pounds each and the L1a locomotives weighed 273,000 pounds. The firebox was 237 square feet, the evaporative heating surface was 3,481 square feet and with the superheater the combined heating surface was 4,226 square feet. Later the boiler pressure was raised to 200 psi which increased the tractive effort to 55,606 pounds.
In 1913, another twenty "Mikados" came from ALCO and were designated as Class L-2 with road numbers 840 through 859 assigned. These locomotives had 63" diameter drivers, 26" x 28" cylinders, a 200 psi boiler pressure, they exerted 51,075 pounds of tractive effort and each weighed 285,000 pounds. The firebox was 212 square feet, the evaporative heating surface was 3,551 square feet and with the superheater the combined heating surface was 4,296 square feet. During WW II many of the Class L-2s were rebuilt to include new smokeboxes, new cylinders, feedwater heaters and thermic siphons were added to the firebox
In 1918, five new locomotives were delivered by ALCO prior to the USRA taking control. This group was assigned road numbers 860 through 864 and was designated as Class L-3. These locomotives were very similar to the Class L-2s except they had cast trailing trucks and a slightly larger tender and the boiler pressure was raised to 215 psi. The L-3 locomotives had 63" diameter drivers, 26" x 28" cylinders, a 215 psi boiler pressure, they exerted 54,906 pounds of tractive effort and each weighed 290,800 pounds. Later in 1918 the USRA allocated ten "Mikado-Light" locomotives to the C&A. These ten locomotives were designated as Class L-4 and given road numbers 875 through 884.
The L-4 locomotives had 63" diameter drivers, 26." x 30" cylinders, a 200 psi boiler pressure, they exerted 54,724 pounds of tractive effort and each weighed 290,800 pounds.
The last C&A "Mikados" were built by ALCO and arrived in 1921. These five locomotives were leased from the Standard Oil Company of Indiana along with 500 coal cars. The locomotives and cars were used to haul coal to Standard Oils refineries. Later the C&A bought them. These 2-8-2s were designated as Class L-4a and were given road numbers 885 through 889. They had 63" diameter drivers, 26.5" x 30" cylinders, a 200 psi boiler pressure, thet exerted 56,849 pounds of tractive effort and each weighed 298,000 pounds.
After the acquisition the B&O reclassified and renumbered all of the former C&A locomotives. The "Mikado" type were reclassified in the "Q" series and given new road numbers 4330 through 4399.
There are no surviving C&A 2-8-2 "Mikado" type locomotives.
|C&A Class||Alton Class||Qty.||Road Numbers||Alton Numbers||Year Built||Builder||Notes|
Although delivered with a few more tubes and 2 fewer flues, this class was virtually identical to the L1 (Locobase 9100). Over time, the boilers would become identical and would be pressed to 200 psi.
The 20 L-2s were based on EH Harriman's passenger-service Mikado design originally supplied to the Union Pacific. They obviously were a relatively small 2-8-2; five L-3s (Locobase 6626) were near-duplicates. Steam admission came through relatively capacious 15" (381 mm) piston valves.
Later renumbering and reclassification (after the C&A's bankruptcy in 1922 and acquisition by the B&O in 1929) resulted in a continuous numbering series for the L-2/L-3 (4360-4384) and class designations of Q-6 and Q-7.
Rebuilds in World War II resulted in a virtually new engine. To the existing boiler, the Alton attached new smokeboxes, feedwater heaters, and new cylinders. In addition, the firebox was fitted with thermic syphons.
Locobase 1414 describes the first 20 Mikes delivered to the Alton; this entry describes the next five.
Although similar, there were some differences in the data: Somehow, the superheater area increased by almost 50 sq ft (although the number and length of the flues and the type of superheater element appear to have stayed the same). Also, as inevitably happened in these "repeat" orders, adhesion weight grew by almost five tons. Piston valve diameter was 15" (381 mm).
After the B & O took over the Alton in 1931, it redesignated the class as Q-7 and renumbered them. 4380 and 4383-4384 were scrapped in 1947, but 4381-4382 were sold to the Gulf, Mobile & Ohio.
successful design in 1918-1919. These 10 engines were assigned to the Chicago & Alton and represented the zenith of freight power on the C&A. They were later redesignated Q-8 and renumbered 4385-4394.
Locobase doesn't know if these Mikados were delivered with superheaters, but, if not, they soon received a kit. Also, their delivery boiler pressure of 170 psi was soon raised to 200 psi, as shown in the specifications.
Comparing this Brooks engine with the Alton Consolidations produced by the same builder in the same year (Locobase 9096) illustrates just how much boiler was gained by adding a trailing truck. At this point, however, the grate area didn't show a commensurate increase; in fact, the H8's grate was bigger.
|Specifications by Steve Llanso of Sweat House Media|
|Class||L-1A||L-2/Q-6||L-3 / Q-7||L-4/Q-8||L1|
|Railroad||Chicago & Alton (C&A)||Chicago & Alton (C&A)||Chicago & Alton (C&A)||Chicago & Alton (C&A)||Chicago & Alton (C&A)|
|Number in Class||20||20||5||10||10|
|Road Numbers||810-829||840-859||860-864 / 4380-4384||875-884||800-809|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||16.50 / 5.03||16.50 / 5.03||16.50 / 5.03||16.70 / 5.09||16.50 / 5.03|
|Engine Wheelbase (ft / m)||34.75 / 10.59||35.17 / 10.72||35.17 / 10.72||36.10 / 11||34.75 / 10.59|
|Ratio of driving wheelbase to overall engine wheebase||0.47||0.47||0.47||0.46||0.47|
|Overall Wheelbase (engine & tender) (ft / m)||67.04 / 20.43||64.10 / 19.54||71.19 / 21.70||71.38 / 21.76||67.04 / 20.43|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||54,700 / 24,812|
|Weight on Drivers (lbs / kg)||214,500 / 97,296||217,600 / 98,702||222,600 / 100,970||221,500 / 100,471||212,300 / 96,298|
|Engine Weight (lbs / kg)||273,000 / 123,831||285,100 / 129,319||285,300 / 129,410||290,800 / 131,905||269,000 / 122,016|
|Tender Loaded Weight (lbs / kg)||167,600 / 76,022||178,425 / 80,932||182,000 / 82,554||185,500 / 84,141||167,000 / 75,750|
|Total Engine and Tender Weight (lbs / kg)||440,600 / 199,853||463,525 / 210,251||467,300 / 211,964||476,300 / 216,046||436,000 / 197,766|
|Tender Water Capacity (gals / ML)||8500 / 32.20||9000 / 34.09||9500 / 35.98||10,000 / 37.88||8500 / 32.20|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||13.50 / 12.30||18 / 16.40||18 / 16.40||16 / 14.50||13 / 11.80|
|Minimum weight of rail (calculated) (lb/yd)||89||91||93||92||88|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||62 / 1575||63 / 1600||63 / 1600||63 / 1600||62 / 1575|
|Boiler Pressure (psi / kPa)||170 / 11.70||200 / 13.80||200 / 13.80||200 / 13.80||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||28" x 30" / 711x762||26" x 28" / 660x711||26" x 28" / 508x711||26" x 30" / 660x762||28" x 30" / 711x762|
|Tractive Effort (lbs / kg)||54,817 / 24864.60||51,076 / 23167.71||51,076 / 23167.71||54,724 / 24822.42||64,490 / 29252.21|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.91||4.26||4.36||4.05||3.29|
|Firebox Area (sq ft / m2)||212 / 19.70||242 / 22.48||242 / 22.49||280 / 26.02||237.20 / 22.04|
|Grate Area (sq ft / m2)||49.50 / 4.60||70.40 / 6.54||70.40 / 6.54||66.70 / 6.20||49.50 / 4.60|
|Evaporative Heating Surface (sq ft / m2)||3551 / 330.02||4215 / 391.58||4216 / 391.82||3783 / 351.58||3481 / 323.51|
|Superheating Surface (sq ft / m2)||745 / 69.24||890 / 82.68||912 / 84.76||882 / 81.97||745 / 69.24|
|Combined Heating Surface (sq ft / m2)||4296 / 399.26||5105 / 474.26||5128 / 476.58||4665 / 433.55||4226 / 392.75|
|Evaporative Heating Surface/Cylinder Volume||166.09||244.97||245.03||205.21||162.81|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||8415||14,080||14,080||13,340||9900|
|Same as above plus superheater percentage||9846||16,474||16,614||15,875||11,682|
|Same as above but substitute firebox area for grate area||42,167||56,628||57,112||66,640||55,979|