Plymouth built is first diesel in 1927, and it has been the country's most prolific small gas and diesel locomotive builder, with 7500 to date. Most of these are small mine and industrial locomotives of less than 25 tons. They are noted for their torque-converter locomotives, and almost all later production uses that type of transmission.⁽¹⁾

Plymouth is about 55 miles sw of Cleveland on the ex-B&O Sandusky - Mansfield line (Ashland RR operates this portion today).Also crossing the B&O just behind the shops is the Wheeling & Lake Erie (ex-Akron Canton & Youngstown RR). Most of the units were shipped out of here on the B&O. 1987 Gary Morris
B.C. Forest Service Ply TLC 2T, 1930 BC Archives	Leslie Salt [Cargill] Ply CL/2 4T #115 #2, Newark CA	Riverview & Woodside RR Ply CL/2 NG GM #14 , Woodstown, NJ, 2003 Bob Vogel	Austin Powder 3.5T RLH/2 36" #3, nee Olin Corp./Liberty Powder (Mt. Braddock, PA) 1942 Mike Hall
Austin Powder 3.5T TID #6 or 7?, nee Liberty Powder Co. #4 Mt. Braddock, PA 1954 Mike Hall	Maine Narrow Gauge RR Ply 4 ton #14, Portland ME, ex Edaville 14 Dave Sherron	Edaville Ply 4 ton #14, South Carver.MA 1976, to Maine Narrow Gauge RR Harv Kahn	Edaville Ply 4 ton #16, South Carver.MA 1976, to Maine Narrow Gauge RR Harv Kahn
Lake Erie Rail car Plymouth DCL-6r, New London OH 1991 Tom Boylan	Austin Powder 5T FGT/4 36" #9, nee Badger Army Ammunition Plant #CO-20 Bariboo, WI 1957 Mike Hall	Austin Powder Ply HSD 6T 36" #10, 1976 Mike Hall	USA Ply H 4T? #588, Ardenwood Park, Newark CA, ex USA NG Solvent Recovery, WI
Ply HSD 5T, PLW 1986 Howard W. Ameling	Lynchburg Foundry PLY HSD 5T , Radford, VA 1978 Mac Connery	East Tennessee & Western North Carolina Ply HSD 8T 36" #16, Elizabethton TN 2004, nee Peabody Coal KY, ex Texas Gulf, Sltville VA, blt 1977, cn7229 , Cat 3304 100hp Mark Milbourne	Moses R White Jr Lumber Co Ply DL GE 5T 36" gauge, South Mills NC 2002, blt 1943 Russell Underwood
Comox Logging & Railway Ply DL2 7T [rblt 1974] #107 , Ladysmith BC, blt 1924, cn1662, nee Sydney E. Jenkins #1, exx Alberni Pacific #7, ex Crown Zellerbach #107, to Crown Forest#107, to Ladysmith RRHS #107, to Alberni Valley Museum Gordon P. Hulford	Ply DLB 8T , Bealton VA 1995 Russell Underwood	AMAX Ply DLC 8T? #4, Carteret, NJ, 1979 Mike Jackson	Ft Dix Ply DLB #1 JR Welsh
Laws Museuum Ply FL NG 4T? #11, Bishop, CA 2004 Tom Hallendorf	Laws Museuum Ply FL NG 4T? #11, Bishop, CA 2004 Tom Hallendorf	Penn Glass Sand (US Silica) PLY FLH/2 6T NG #14, Berkeley Springs, WVA, 2005 Greg Dahbura	Penn Glass Sand (US Silica) PLY FLH/2 6T NG , Hancock WV 1986 Kermit Geary Jr
Plymouth 6T FLH	Pine Creek RR Plymouth FLH/2 6T? #4 , Allaire State Park, NJ 2007 Randall C. Kotuby	Teaberry & Southern Ply FL 4T NG #6 , St Marys, PA 2007 Matt Helton	Ply FLH 6T NG. Albion, ME 2004 Stephen Hussar
Austin Powder 7T DL #4 Mike Hall	Austin Powder 7T DL #5 Mike Hall	Plymouth NG DL? Jim Sands	Carbon Limestone Co Ply DL 7T #1, SME LimestonePA Hillsville PA 1971 N.Y., V. & N. Rwy
Riverview & Woodside Ply DL 7T RR#1, Pilesgrove, NJ 01 Bob Vogel	Point Defiance Quinault & Klickitat RR Ply DLC 6 8T #2689, Camp 6 Logging Museum, Tacoma, WA 2003, blt 1927 cn2689 , nee Johnson, Drake & Piper, exx Everett Pulp & Paper,exxx West Tacoma Newsprint urslow	Point Defiance Quinault & Klickitat RR Ply DLC 6 8T 24" #2689, Camp 6 Logging Museum, Tacoma, WA 2003, blt 1927 cn2689 , nee Johnson, Drake & Piper, exx Everett Pulp & Paper,exxx West Tacoma Newsprint urslow	Plymouth 8T
Augusta RR Plymouth DLL2 8T #6, nee USA 821, blt 1940 cn4030 Don Ross	Cranberry Plymouth 8T DL #2, Edaville RR, Carver MA, ©Jack Clifford	AMAX Ply D 8T? #11 , Carteret, NJ 1979 Mike Jackson	Homestake Gold Mine Whit 8-GM-24 8T 18"gauge #13172, Lead, SD 2006,blt 1939 cn13172 ex Bald Mountain Mining #4 Mike Oestreich
Homestake Gold Mine Whit 8-GM-24 8 tons 18"gauge #13172, Lead, SD 2006,blt 1939 cn13172 ex Bald Mountain Mining #4 Mike Oestreich	MAPA Ply JL #14, Muddy Creek Forks, PA2002 Michael E Lijewski	Dragon Cement Plymouth 10T JLA #3, Edaville RR, Carver MA, cn3169 ©Jack Clifford	Alton & Pacific 7T DLB Ply Don Ross
Plymouth DGT 10T? , Cresson PA 1996, cn6333 Arnold Morscher	Kosciusko & Southwestern RY Ply DGT 10T #202, Kosciusko MS 2000 ©Thomas Lucas	Banner Ind Ply DGT? 10T #20 , Ohio Don Ross	South Coast Plymouth 10T DDT #4, Raceland LA 1978, blt 1955 cn5888 Michael M. Palmieri
Santa Catalina Island Co Ply JLA 10T #103, sn3368 1929 Johnathon Kruger	General American Tank car repair Ply JLA 10T #65-1-G, UP West Colton Yard 2002 Steve Hoskins	HS Plymouth 10T JLA Gas #2 Bill Waller	Morris County Central Ply JLB 10T #18, 1978, Newfoundland NJ, blt 1938 for General American Trans Charlie O'Hay
HQ Ply JLC #12012 , Canadian Railway Museum, Quebec, blt 1928 Pierre Lacombe	Palmetto Brick 10T DHL 36" #1939, Wallace SC, blt 1939 cn4023, ex EI DuPont Warren Calloway	Palmetto Brick 10T DHL 36" #1939, Wallace SC, blt 1939 cn4023, ex EI DuPont Warren Calloway	Palmetto Brick 10T DHL 36" #1939, Cheraw, SC 2005, blt 1939 cn4023, ex EI DuPont Joseph C. Hinson
Palmetto Brick 10T DHL 36" #1946, Wallace SC, blt 1948 cn5402, ex Richtex Brick, nee Nassau Brick Warren Calloway	TRCX Army 10T Plymouth #1061, TC Railway Museum Jeff Lubchansky	Lawrence Portland Cement Plymouth 10T JLA #3 Otto Perry	Zwolle Railcar Plymouth 10T JLA, Zwolle, LA 1983 Lowell McManus
Safe Harbor Water Power Co Ply 10T JLA, Safe Harbor PA, #E126 Bill Waller	Safe Harbor Water Power Co Ply JLA 10T #7, Safe Harbor PA 1933 Bud Laws	Safe Harbor Water & Power Ply JLA-2 G/M 10T #61, Tamaqua PA 2004, blt 1930 cn3562, nee Arundel Clint Chamberlin	Safe Harbor Water & Power Ply JLA-2 G/M 10T #61, Tamaqua PA 2004, blt 1930 cn3562, nee Arundel Clint Chamberlin
Black Hills Central Ply F 3' NG , Keystone, SD 1983 Ken Houghton	Dupont Ply DGT? #D9, Plymouth, OH 1989 Ken Houghton	Niles Canyon Railway Ply JLA 10T #103, Sunol, CA 2006, nee Santa Catalina Island, exxxx American Bridge, exxx M. Lummus Co, exx Judson Steel, ex Castro Point 103, blt1929 cn3368 w/Climax R4 SSFRailFan	Catawissa RR Ply JL 10T #2, 2006 Ron Knepp
Pioneer Tunnel 48" Ply , Ashland PA 2006 Ron Knepp