
Five-needle train signalling instrument used on the London and Blackwall Railway
1840
1840
1845-1855
circa 1860
1839
1862
1891
1879
1876
after 1859
1858-1866
before 1857
1853
1844
circa 1846
1860
1855
1860
1870
circa 1854
circa 1860
1889
1875
1877
1869
1873
1895
1870-1888
circa 1891
1888
1893
1884
1859
1936
1891
1876
1862
1840
1883
1877
1840
300 BCE; 1905-1915
1862-1863
1840
1882-1890
1883
1889-1894
1925; 1862
1835-1845
circa 1896
1865-1875