Railway signals typically use a lever system that are classified as class 1 levers, where the fulcrum is located between the effort (operator's hand) and the load (signal). This lever system allows the operator to easily control the movement of the signal with less effort.
Rhymney Railway A class was created in 1910.
Metropolitan Railway A Class was created in 1864.
Barry Railway Class B was created in 1888.
Barry Railway Class H was created in 1896.
Highland Railway L Class was created in 1882.
Highland Railway Loch Class was created in 1896.
Metropolitan Railway K Class was created in 1925.
Highland Railway F Class was created in 1874.
Metropolitan Railway G Class was created in 1915.
Rhymney Railway M class was created in 1904.
Highland Railway E Class was created in 1886.