1895-1896 - Mahoning Valley Electric Railway Co.
1896-1906 - Mahoning Valley Railway Co.
1906-1920 - Mahoning & Shenango Railway & Light Co.
1920-1932 - West End Traction Co.
Interurban lines:
Youngstown-Warren (constructed 1895, discontinued/replaced with buses 1932)
Niles-Mineral Ridge (constructed 1899, discontinued 1927)
Youngstown-New Castle (constructed 1900, discontinued 1933)
Youngstown-Sharon (constructed 1901, discontinued 1939)
Warren-Leavittsburg (constructed 1901, discontinued 1924)
Hubbard-New Castle (constructed 1902, discontinued 1925)
Replacement bus companies:
Penn-Ohio Coach Lines (1923-1945)
Ohio Greyhound Lines (after 1945)
HISTORIC INTERURBAN RAILWAY
Youngstown-Leetonia
1907-1916 - Youngstown & Southern Railway Co.
1916-1944 - Youngstown & Suburban Railway Co.
1944-1948 - Youngstown & Southern Railway Co.
1895-1899 - Akron Bedford & Cleveland Railroad Co.
1897-1899 - Akron & Cuyahoga Falls Rapid Transit Co. (Akron-Ravenna)
1899-1902 - Northern Ohio Traction Co.
1892-1902 - several companies
1902-1906 - Canton-Akron Railway Co. (to Uhrichsville)
1913-1924 - Cleveland Alliance & Mahoning Valley Railway (Ravenna-Alliance/Warren)
1902-1926 - Northern Ohio Traction & Light Co.
1926-1932 - Northern Ohio Power & Light Co.
1931-1940 - Inter-City Rapid Transit Co. (Canton-Massillon)
Interurban lines:
Cleveland-Akron (constructed 1895, discontinued 1932)
Akron-Canton (constructed 1892, discontinued 1928)
Canton-Massillon (constructed 1892, discontinued 1940)
Massillon-Uhrichsville (constructed 1892, discontinued 1929)
Akron-Wadsworth (constructed 1907, discontinued 1928)
Massillon-East Greenville (constructed 1907, discontinued 1929)
Akron-Kent (constructed 1897, discontinued 1931)
Kent-Ravenna (constructed 1900, discontinued 1931)
Ravenna-Alliance (constructed 1913, discontinued 1931)
Ravenna-Warren (constructed 1915, discontinued 1931)
Replacement bus companies:
Penn-Ohio Coach Lines (1923-1945)
Ohio Greyhound Lines (after 1945)
Was never part of the Penn-Ohio system, but nevertheless operated in the same general area.
1902-1904 - Stark Electric Railway Co.
1904-1939 - Stark Electric Railroad Co.
Interurban line:
Canton-Alliance-Salem (completed 1904)
Abandoned 1939
Replacement bus companies:
Stark Transit (until 1957)
Tri-City Transit (1957-1963)
Information on how the Penn-Ohio bus operations evolved into part of the Greyhound bus system.