
model sykes lock and block signalling system
1875
1875
circa 1871
1876
2000-100 BCE
1879
1865
1867-1868
1875
1877
1870
1866-1870
1878
1870-1875
1872
1864
circa 1868
1879
1872 (original); 1909 (model)
1955; 1830
1875
1871
1878-1879
1870s
1870-1880
circa 1880
1870-1880
1870-1880
1865
1875
1867
1867
1872
1863-1865
1879
1867
1876
1863-7
1865-1866
1878
1866
1934
1879
1893-4
1865
1872-1880
1876
1878
1877
1880
1801-1840 (original); 1901 (model)