Signal Block Bell, South Eastern Railway
1862
1862
1875
1850
1850-1859
1860
1855
1875
1850
1865
1858
1854
1870
circa 1861
1867
1867
1857
1857-1858
1858
1865
1857-1858
1865-1866
1857-1858
1866
1865
1875
1858
circa 1868
1851
1955; 1830
1875
2000-100 BCE
1893-4
1864
1871
1863-1865
circa 1871
1855-1870
1850-1875
circa 1861
1853
1854
1860
1855-1860
1855
1856
1850-1870
1850-1870
1934
1850
1862