Model ground signal, North London Railway
1888
1888
1934
1872 (original); 1909 (model)
1955; 1830
2000-100 BCE
1893-4
1888
1775-1799 (original); 1900-1907 (model)
1990-96
1934
1705-1737
1772 (original); 1919 (model)
1930 (replica); 1834 (original)
1801-1840 (original); 1901 (model)
4000-2001 BCE
1830 (original); 1967 (model)
1887
1730; 1967
1972-3
2500 BCE
1888
1915-1825
1990-95
1888
1901-950
1800-1830
1801-1850
1800-1830
1859; 1986
1888
1945-50
1887
1887
1888
1888
1888
circa 1888
1888
1887
3000-1500
1888
1887
1887
1888
1887
3000-2000 BCE
1887
1888
1834-1836
2000 BCE