Great Eastern Railway were and indeed are once again a Railway company. They originally operated from:
Liverpool Street Station,
The Great Eastern Railway Company was incorporated in 1862 and opened its first line the same year. It was absorbed into the London and North Eastern Railway (LNER) in 1923 when the "big four" were formed. The other three were Western Railway, Southern Railway and London, Midland & Scottish Railway. In 1948 British railways were nationalised. In 1986 Network SouthEast was set up and used Great Eastern as a brand name for some services. In 1991 Great Eastern became a business entity in its own right while remaining a division of Network SouthEast. In 1994 Network SouthEast ceased to exist as a business ahead of privatisation. In 1996 the Great Eastern franchise was prepared for sale and in January of the following year was awarded to FirstBus PLC.
1868. Official underprint type 25 (under the gum) in black.
A number of later perfins have been identified as belonging to this firm. I do not have an illustrations of the perfins but they are referenced in Tomkins as:
See the Philatelic Links and References page for more information on Perfins.