BO, Detroit, Michigan

Baltimore and Ohio Railroad engine no. 5217 passing Wabash Railroad switcher no. 640 at Detroit, Michigan. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-01-005-02

BO, Fostoria, Ohio

Westbound Baltimore and Ohio Railroad engine no. 5557 at crossing in Fostoria, Ohio. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-01-005-04

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Baltimore and Ohio Railroad engine no. 5303. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-01-006-02

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Baltimore and Ohio Railroad engine no. 4330. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-01-007-03

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Baltimore and Ohio Railroad engine no. 5317. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-01-008-01

BO, Fostoria, Ohio

Westbound Baltimore and Ohio Railroad engine no. 6179 at crossing near Fostoria, Ohio. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-03-085-02

BO, Auburn, Indiana

Westbound Baltimore and Ohio Railroad engine no. 5564 at Auburn, Indiana. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-03-116-01

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Baltimore and Ohio Railroad engine no. 4412. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-03-116-02

BO, Fostoria, Ohio

Eastbound Baltimore and Ohio Railroad freight train with I-5 caboose no. C2149 at Fostoria, Ohio. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-03-116-03

BO, Fostoria, Ohio

Eastbound Baltimore and Ohio Railroad engine no. 4602 at Fostoria, Ohio. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-03-116-04

BO, Roselle Park, New Jersey, 1937

Baltimore and Ohio Railroad's Capitol Limited engine no. 5309 at Roselle Park, New Jersey, in 1937. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-04-072-02

BO, Cumberland, Maryland, 1948

Baltimore and Ohio Railroad engine no. 7602 (2-8-8-4) in Cumberland, Maryland, on July 8, 1948. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-04-129-04

BO, Grafton, West Virginia, 1947

Baltimore and Ohio Railroad engine no. 7605 (2-8-8-4) at Grafton, West Virginia, on September 16, 1947. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-04-130-02

BO, Riker, Pennsylvania, 1948

Baltimore and Ohio Railroad engine no. 7527 (2-6-6-2) at Riker, Pennsylvania in 1948. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-05-099-01

BO, 1958

Baltimore and Ohio Railroad engine no. 657 in 1958. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-08-016-02

BO, Keyser, West Virginia, 1949

Baltimore and Ohio Railroad engine no. 7606 (2-8-8-4) at Keyser, West Virginia, in 1949. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-08-098-04

BO, Cumberland, Maryland, 1947

Baltimore and Ohio Railroad engine no. 7619 (2-8-8-4) at Cumberland, Maryland, on September 14, 1947. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-08-099-02

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Baltimore and Ohio Railroad's Lady Baltimore engine no. 1 (4-4-4). Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-08-148-03

BO, New Castle, Pennsylvania, 1955

Baltimore and Ohio Railroad engine no. 6142 (2-10-2) at New Castle Junction, Pennsylvania, on July 3, 1955. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-10-038-01

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Baltimore and Ohio Railroad lineup of engine no. 6208 and no. 6217. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-10-040-01

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Baltimore and Ohio Railroad engine no. 5652. Photograph by Robert A. Hadley, © 2017, Center for Railroad Photography and Art. Hadley-10-054-03