Between 1922 and 1925, seventeen more Class MT "Mountain" type locomotives were received from ALCO. They were numbered 1671 through 1680 (later changed to 471 through 480) and 1691 through 1697 (later changed to 491 through 497).
The last five Class MT 4-8-2s were delivered from the Baldwin Locomotive Works in 1926. These were numbered 466 through 470 and were very similar to the "Mountains" built by ALCO.
All Class MT "Mountains" had 27" dia. x 28" stroke cylinders, 69" drivers and with a 210 psi boiler pressure exerted 52,920 lbs of tractive effort.
1919 58035-58037 (road #481-483)
1920 62384-62387 (484-487), 62417-62419 (488-490),
1922 63531-63532 (491-492),
1923 64584-64588 (493-497), 65265-65269 (476-480).
1925 66322-66326 (471-475).
1926 Baldwin works numbers were 58997-58998 in January, 59059-59061 in March.
Total engine weight ranged from 316,000 lb to 326,500 lb. The class was delivered with a stated superheater area of 900 sq ft (83.6 sq m) and boilers set to 190 psi (13.1 bar). It wasn't too long before the Central changed the boiler's layout from its original arrangement of 198 2 1/4" tubes and added 61 sq ft (5.65 sq m) of syphons to the firebox heating surface. In fact, the last batch of Baldwins were delivered with syphons. Several of the engines had had their pressure settings raised to 200 psi by 1932 and by 1947, boilers on the entire class were set to 210 psi as shown in the specs.
Somehow the superheater later gained 64 sq (5.95 sq m) ft of heating surface without changing the number, diameter, or length of flues. The increase might have represented a recalculation rather than any actual changes.
These Mountains ran the CofGa mainlines pulling trains from the Midwest to Florida. Retirements began in 1948 and ended in 1953.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Central of Georgia (CofGa)|
|Number in Class||32|
|Road Numbers||1671-1697/466-470, 471-497|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.46|
|Overall Wheelbase (engine & tender)||86.08'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||218200 lbs|
|Engine Weight||319100 lbs|
|Tender Light Weight||189700 lbs|
|Total Engine and Tender Weight||508800 lbs|
|Tender Water Capacity||9500 gals|
|Tender Fuel Capacity (oil/coal)||15 tons|
|Minimum weight of rail (calculated)||91 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||210 psi|
|Cylinders (dia x stroke)||27" x 28"|
|Tractive Effort||52805 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.13|
|Firebox Area||348 sq. ft|
|Grate Area||66.70 sq. ft|
|Evaporative Heating Surface||3702 sq. ft|
|Superheating Surface||967 sq. ft|
|Combined Heating Surface||4669 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||199.51|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||14007|
|Same as above plus superheater percentage||16948|
|Same as above but substitute firebox area for grate area||88427|