Chesterfield; Chesterfield Corporation Transport; 1914-1986; tramway and bus company
Chilwell, Nottinghamshire; Barton Transport; 1908-1989; bus company
Derby Corporation Transport; 1932-1986; Operated using trolleybuses until 1967; privatised in 1986 and later taken over by Arriva.
East Midland Motor Services; 1927-1989
Midland General; 1920-1971; Bus company based in Alfreton. Became part of Trent Motor Traction in 1971.
Nottinghamshire and Derbyshire Traction; 1903-1953; Bus company running services between Ripley and Nottingham, originally by tram. Merged with Midland General in 1953.
Trent Motor Traction; 1913-1989; Bus company serving Derbyshire and Nottinghamshire; merged with Barton in 1989 to form TrentBarton.
National Coal Board