
Model Great Northern Railway Centre-pivot Semaphore Signal
c.1912
c.1912
1877
1927
1762
1922
1837
1989
1955
1955
1971
1974
1972
1963
1984
1984
1974
1969
1974
1975
1969
1974
1986
1986
1973
1954
1986
1986
1986
1960
1986
1974
1974
1969-1979
1972
1972
1989-1999
1951
1969
1974
1975