
model sykes lock and block signalling system
1875
1875
circa 1871
1876
2000-100 BCE
1879
1875
1877
1870
1878
1870-1875
1872
1879
1872 (original); 1909 (model)
1955; 1830
1875
1871
1878-1879
1870s
1870-1880
circa 1880
1870-1880
1870-1880
1875
1872
1879
1876
1878
1934
1879
1893-4
1872-1880
1876
1878
1877
1880
1801-1840 (original); 1901 (model)
1775-1799 (original); 1900-1907 (model)
1871
1839 (original); circa 1988 (replica)
1872
1870
1874
1880
1870
1869
1930 (replica); 1834 (original)
1874
1873
1872
1871