![](https://coimages.sciencemuseumgroup.org.uk/494/324/large_thumbnail_1994_7263_0001.jpg)
Signal Block Bell, South Eastern Railway
1862
1862
1847
1850
1850-1856
1850-1859
1864
1860
1863-7
1845
1849
1855
1846-1859
1845
1842
1850
1865
1858
1834
1834
1848
1855-1860
2000-100 BCE
1854
1843
1856
1893-4
1861-1866
circa 1840
circa 1861
1840-1860
1855
1838
1835-1845
1934
1840-1860
1850
1848-1852
1841
1858
1835
1846
1833
1835
1837
1837
1849
1840-1850
1860
1836
circa 1861