![](https://coimages.sciencemuseumgroup.org.uk/494/323/large_thumbnail_1994_7263.jpg)
Telegraph Block Instrument from Southerham Junction
Telegraph Block Instrument, London Brighton & South Coast Railway, permissive, with bell, from Southerham Junction.
Telegraph Block Instrument, London Brighton & South Coast Railway, permissive, with bell, from Southerham Junction.