4-6-0 CLASS O

CLASS O TEN-WHEELER TYPE 4-6-0

Subclasses O, O-1, O-2, O-3 and O-4

There were 52 locomotives in the O Class built from 1903 to 1923. The builders were Lima, Baldwin, Schenectady, Rhode Island and Pittsburg. They had 63 and 67 inch drivers and could be found in passenger and freight service. The Maine Central had only four steam engines newer than the eight O-4 engines built in 1923. Several lasted until 1953.

Class O consisted of engines built by ALCO Schenectady, five built in 1903 and eight in 1905, all with 21x26 inch cylinders and 63 inch drivers, numbered 351-363. All had inside valve gear.

Built by ALCO's Schenectady plant in 1905. Scrapped in 1937.

353 was built by ALCO Schenectady in 1903. Scrapped in 1937. Waterville, 1935.

357 was built by ALCO Schenectady in 1905. Scrapped in 1937. North Stratford, N.H., 1933.

361 was built by Alco Schenectady in 1905. The longest lived of the subclass; scrapped in May 1948.

361 at Bath, Maine.

361 at Kineo, Maine by Edwin B. Robertson.

Class O-1, numbered 364-372 were duplicates of the O Class but all nine were built in 1906 by ALCO's plant in Providence, the Rhode Island Locomotive Works. All had Walschearts valve gear.

Scrapped in August 1942.

367 was scrapped in October 1953. Shown at Portland in 1941.

367 at St. Johnsbury, Vermont on August 12, 1946. 367 is doubleheading with 2-8-2 624 on Train 375. St.J&LC 2-8-0 39 is on Train74. Photographed by Philip R. Hastings.

369 was scrapped in June 1951.

370 is at Bartlett, N.H. on October 8, 1939. Scrapped October 1953.

Class O-2 were essentially the same as the previous subclasses but all ten were built by Baldwin in 1907 and 1908 numbered 373-382 .

373 was scrapped in November 1953. Waterville 1945.

Fireman's side of 373. Brunswick 1936.

374 at Brunswick December 24, 1946. Scrapped October 1947.

379 was scrapped November 1953.

380 was scrapped October 1953.

Class O-3 consisted of twelve locomotives, eight built by ALCO Pittsburg in 1918 and four built by ALCO Schenectady in 1920, numbered 401-408 and 409-412, respectively. The engines were not numbered in the same series as the earlier O Class engines because their specifications were different. Cylinders were a much larger 22x28 inches and drivers were 67". They were only slightly more powerful than the earlier O Class engines because the higher drivers offset the larger cylinders. Their appearance was distinctive because of the large air tank mounted on the pilot deck. The O-3 and O-4 Class used Baker valve gear.

401 was the first of the Pittsburg built O-3's. Scrapped in 1949.

409 was the first of the Schenectady O-3's. Built in 1920 and scrapped May 1953.

Notice the coal pusher.

403 at Portland in August 1920. Scrapped April 1949.

403 was built by Pittsburg.

403 at Brunswick August 1940.

404 was scrapped March 1951.

407 is at Brunswick in 1941. Scrapped April 1949.

410 was scrapped in June 1950.

411 was scrapped in March 1951.

Class 0-4 consisted of eight locomotives built by the Lima Locomotive Works in 1923. They were numbered 383-390 continuing the O-2 Class number series since they also had 63" drivers. Cylinders were 20x28", however. rather than the 21x26" used on the O, O-1 and O-2 Classes. Their power was approximately the same because the longer stroke offset the reduction in the cylinder bore.

383 was the first of the Lima O-4's. It was scrapped in March 1951.

384 is at the Waterville coaling plant. Scrapped in June 1952.

387 at Brunswick in April 1938. Scrapped December 1952.

387 Lima 1920.

388 was scrapped in May 1950.

390 was scrapped in June 1949

An unidentified O-4 4-6-0 with a cut-back tender for better rear vision.