![](https://coimages.sciencemuseumgroup.org.uk/494/324/large_thumbnail_1994_7263_0001.jpg)
Signal Block Bell, South Eastern Railway
1862
1862
1847
1821-1831
1875
1825
1850
1850-1856
1850-1859
1864
1860
1850-1870
1820-1850
1835-1870
1863-7
1845
1849
1855
1846-1859
1845
1875
1842
1850
1832
1865
1858
1834
1834
1848
1855-1860
2000-100 BCE
1854
1843
1870-1880
1856
1813
1893-4
1870
1861-1866
1870s
1831-1870
1821-1850
1831-1870
circa 1800
1878
circa 1840
1809
circa 1861
1872-1880
1879
1840-1860