
Model ground signal, North London Railway
1888
1888
1890
1892
1897
circa 1900
1871
1901
1874-1900
1886-1887
circa 1880
1900
circa 1905
1886
1875
circa 1890
circa 1890
circa 1890
circa 1890
1892-1902
1889
1870-1890
1871-1900
1876
1880-1890
1877-1897
1872 (original); 1909 (model)
1875
circa 1900
1900
circa 1897
1903
1903
1898-1899
1901
1884
1906
1898
1890
1896
1896
1906
1875
1885-1894
About 1890
1890
1887-1903
1889
1875-1890
1876
1878