Class 101 (Locobase 6286)

Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005.. See Locobase 6283 for comments on the Ten-wheelers as a group.

This subclass used the same boiler, grate, and cylinders as the 93, but had smaller drivers. They were the last M & O 4-6-0s with 57" drivers.

Works #23991, 24038-39, 24044, 24076, 24103-104, 24146, 24169, all but the last two delivered in March 1904 and those following in April.

Road numbers first ranged from 101-103, 210-211, 104-107; a later renumbering resulted in 300-302, 320-321, 303-306.

Class 121 (Locobase 6284)

Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005.

Rogers actually delivered two versions that seem to have differed only in driver diameter. This, the more-numerous variant, was probably the freight hauler.

Works #: 5124-5129 (June 1896, road 50-55, later 123-128),

5160-5163 (January 1897, road 48-49 & 56-59, later 121-122 & 129-132),

5194-5208 (June 1897, road 116-130, later 133-147),

5268-5272 (March 1898, road 131-135, later 148-152),

5339-5348 (December 1898, road 153-162),

5440-5444 (October 1899, road 163-167),

5457-5471 (November 1899, road 168-177), and

5604-5614 (August 1900, road 178-182).

Class 136 (Locobase 6285)

Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005.Rogers actually delivered two versions that seem to have differed only in driver diameter.Out of the 90, only 20 had mixed-traffic driver dimensions.

Works #:

5247-5251 (March 1898, road 136-140 and later 200-204),

5329-5338 (November 1898, road 143-152, later 205-214), 5474-5478 (November 1899, road 178-182, later 215-219).

Class 212 (Locobase 6288)

Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005. See Locobase 6283 for comments on the Ten-wheelers as a group.

A year after the first larger-boilered Ten-wheelers were manufactured for the M & O, the next batch of 30 were produced in August 1905. The only major difference was the lengthening of the piston stroke by two inches. Works #23835, 23853-57, 23902, 23909, 23928, 23938. Seventeen months later, another 30 were built to the same specs. These were works # 29925-28, 29952-53, 29965-67, 30002, 31980-81, 32020-21, 32048-51, 32077-78, 32087, 32095, 32116-17, 32144-45, 32163, 32174, 32204-05.

All 60 were later renumbered 325-384.

Class 230 (Locobase 6287)

Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005. Works #29771-29772, 29814-29818,

29827, 29844-29845

See Locobase 6283 for comments on the Ten-wheelers as a group.

At the same time Baldwin was building the 57" version of the 20x26" class of Ten-wheelers (see Locobase 6286), the works began turning out the definitive larger-boilered design. In addition to more heating surface, the engine had cylinders 1" larger in diameter.

Five (232-233, 237-238, 240) later received superheaters, a makeover that left the boiler with 181 2" tubes and 28 5 1/2" flues. In the process, they also were fitted with Baker valve gear and, in four out of five, piston valves. 237's piston valves measured 12" in diameter (to go with the 22"x 28" cylinders) while the others were only 8". 240 retained its slide valves.

Class 93 (Locobase 6283)

Data from table supplied by Allen Stanley in March 2004 anddiagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005.

Baldwin's Ten-wheelers, like the Rogers engines of a few years earlier, came in two driver diameters. All the significant dimensions had grown, however, and would continue to do so. This batch represents the smallest segment of the Baldwin flood - 7 locomotives with 63" drivers and 20x26" cylinders and none in consecutive building order with any other. Works #22342, 22351, 22354, 22366, 22379, 22454, 22457 in June-July 1903. At first numbered 93-96, and 98-100, they were later renumbered 220-223, 225-227.

One other -- 22378 / road 97/224 -- had 57" drivers, but was otherwise identical. Its tractive effort calculated to be 31,015 lb.