Signal Block Bell, South Eastern Railway
1862
1862
1847
1850
1850-1856
1850-1859
1864
1860
1850-1870
1863-7
1845
1849
1855
1846-1859
1845
1842
1850
1865
1858
1848
1855-1860
2000-100 BCE
1854
1843
1856
1893-4
1870
1861-1866
1870s
circa 1861
1855
1850-1870
1850-1870
1934
1850
1848-1852
1867
1858
1846
1849
1860
1867
1867
circa 1861
1845-1855
1854
1857
1842
1863-1865
1860
1851