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
Comox Logging & Railway Ply BL2 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	Leslie Salt [Cargill] Ply CL/2 4T #115 #2, Newark CA, blt 1923 cn1534	Riverview & Woodside RR Ply CL/2 NG GM #14 , Woodstown, NJ, 2003 Bob Vogel	B.C. Forest Service Ply TL2 2T, 1930 (blt 1928 cn2856??) BC Archives
Marion's wastewater plant Ply 24" ga TLC 3T, Marion, OH 2008, nee Mosser Construction, blt 1953. cn5641 Geoff Brozny	Austin Powder 3.5T TID #6 or 7?, nee Liberty Powder Co. #4 Mt. Braddock, PA, to Pine River RR MI blt 1954 cn5772 Mike Hall	Austin Powder 3.5T RLH/2 36" #3, nee Olin Corp./Liberty Powder (Mt. Braddock, PA) blt 1942 cn4357 Mike Hall	Black Hills Central Ply F 3' NG , Keystone, SD 1983 Ken Houghton
Austin Powder 5T FGT/4 36" #9, nee Badger Army Ammunition Plant #CO-20, ex Olin Corp #OB-568, to Pine River RR MI blt 1957 cn6023 Mike Hall	Moses R White Jr Lumber Co Ply FL 5T 36" gauge, South Mills NC 2002, blt 1943 Russell Underwood	BO Plymouth 18T HL2 #25, ex8900, blt1926 cn2189 Bob Redden	Cotton Plant & Fargo Ply HL 18T #1, Cotton Plant AR George Elwood
Cotton Plant & Fargo, AR Plymouth 18T HL #1 © Gary Stuebben	Cotton Plant & Fargo, AR Plymouth 18T HL #1 George Elwood	Wisconsin Sand & Gravel Plymouth HL-18, #2, Climax R6U, 1928 North Freedom WI Mid-Continent, bee Twomey-Willams, exx White Ceadar Timber, ex ILWisc Pipe, blt 1928 cb2911	National Lime & Stone Ply 18T HL #605, Carey OH 2002, (nee Nat Quarries, blt 1925 cn2029?) David L. Miller
Pacific Electric Ply HLB2 25T #1646, Orange, CA 1955, nee Cleveland SW Ry, exxx Jefferson & NW, exx B Callahan Const, ex Texas & New Orleans #2, to Berg Metals, blt 1932 cn3676	Plymouth HLA 18T	NH Wood River Branch RR Ply HLB 20T #1872 , RI 1930, nee NYNH A100 blt 1927 cn2691 Walker Trans Collection - Bill MacIndoe	Plymouth HLA 18T
Muncie & Western Ply 18T HL-3 #2, blt 1926 cn2446	Strasburg Plymouth HL 3 18T #1, 1978. blt 1926 cn2452 ©Harold Vollrath	Great Southern Plymouth HLC3 24T #4, Dalles, OR 1931, nee St Steel Car, exxAH Coxx, ex Alaska RR #115, to Nat Lime & Stone #3/0605, blt 1927 cn2635 Otto Perry	Milwaukee Sewage Comm Plymouth 20T HL-2 #1 , ex Duluth Crushed Stone Co., cn2683 blt 1927 Don Ross
Canada Crushed Stone Ply HLC 24T #7, Paikin (D) Hamilton ONT1982, blt 1927 cn2669?, ex TP&W 99 Gordon Strathdee % R.L.Kennedy	Canada Crushed Stone Ply HLC 24T #7, Dundas ONT, blt 1927 cn2669? ex TP&W 99 Al Howlett % R.L.Kennedy	Union RR of Oregon Ply 25T HLC-2 #1, Union, OR 1979, nee Guy F Atkinson, exx Bureau of Rec, ex General Const 3, blt 1928 cn2922 Sheldon Perry	Dufferin Concrete Prod. Ply HLB-3 30T #9114, D. Crupi & Sons, Scarborough ONT, blt 1928 cn2992, to St. Lawrence Cement Gordon Strathdee % R.L.Kennedy
Pioneer & Fayette, Ply HLB 25T, Franklin Jct., OH 1983, blt 1936 cn 3835, nee #102, then #10, to Colasanti's Tropical Garden, Ruthven ONT, to W.G.Thompson & Sons, Kent Bridge, ONT. Gordon Strathdee	Buckwheat & Durham RR [fictitious] Ply HLB 25T #1, Kent Bridge ONT, blt 1936 cn3835 , nee Pioneer & Fayette RR, ex W.G.Thompson & Sons, exx Colasanti's Tropical Garden Gordon Strathdee % R.L.Kennedy	San Diego & Imp Valley HLB 25T shop SW, San Ysidro shop CA	BD Ply 25ton HLB #1 , Escanaba & Lake Superior, Crivitz, WI ©John F. Campbell
Amherst Barge Co. Ply HBL 25T , Huntington WVA	H. R. Mandel Ply HLB 25T #1189 , Peoria IL 1961 Don Ross	Landisville RR Ply HLB 3 25T #92, Landisville PA, nee Delaware Valley RR, to Unitied Electric Coal IL, blt 1928 cn2861 David M. Sheppard	H.J. Kaiser Sand & Gravel Ply HLB 30T #307 , Livermore CA, nee Fisher, Ross, McDonal Kahn, exx Pickering Lumber, ex Worden & Forsyth, to #3702, blt 1929 cn3102 Ken Houghton
Austin Powder Ply HSD 6T 36" #10, McArthur OH, to Pine River MI, blt 1976 cn7162 Mike Hall	Sandstone Crag Ply HSG 5T #1 , Coto de Caza CA 2000, nee USA585, ex Olin OB-592, blt 1968 cn 6667	USA Ply HSG 5T #588, Ardenwood Park, Newark CA, exx USA C0281 NG Solvent Recovery, WI, ex Olin Corp #OB-595 Badger Ord blt 1969 cn6728	Ply HSD 5T, PLW 1986 Howard W. Ameling
Lynchburg Foundry PLY HSD 5T , Radford, VA 1978, to Griffin Pipe, to Banner Int, to Copperweld Steel OH, blt 1977 cn7175 Mac Connery	East Tennessee & Western North Carolina Ply HSD 8T 36" #16, Elizabethton TN 2004, nee Peabody Coal KY, exxxx Texas Gulf, exx Berry Iron & metal, ex Doe River Gorge, blt 1977, cn7229 , Cat 3304 100hp Mark Milbourne	Laws Museuum Ply FLB NG 5T #11, Bishop, CA 2004, nee USA KS, ex Apache Powder #11 AZ, blt 1943 cn4583 Tom Hallendorf	Laws Museuum Ply FLB NG 5T #11, Bishop, CA 2004, nee USA KS, ex Apache Powder #11 AZ, blt 1943 cn4583 Tom Hallendorf
Penn Glass Sand (US Silica) PLY FL/2 5T NG #14, Berkeley Springs, WVA, 2005, nee OW Rockwell PA, blt 1925 cn2035 Greg Dahbura	Penn Glass Sand (US Silica) PLY FL/2 5T NG , Hancock WV 1986, nee OW Rockwell PA, blt 1925 cn2035 Kermit Geary Jr	Plymouth 6T FLH	Pine Creek RR Plymouth FLH/2 6T? #4 , Allaire State Park, NJ 2007 Randall C. Kotuby
High Country RR Ply FLB2 5T #4, Denver CO 1978, nee Dupont, blt 1934 cn3742 Bruce Barrett	Teaberry & Southern Ply FL 4T NG #6 , St Marys, PA 2007 Matt Helton	Golden City & San Juan Ply FLH 6T #3, Colorado RR Museum, Denver, CO, blt 1935 cn3784? Andy Inserra	Ply FLH 6T NG. Albion, ME 2004 Stephen Hussar
Plymouth FL? Jim Sands		Edaville Ply 4 ton #16, South Carver.MA 1976, to Maine Narrow Gauge RR Harv Kahn