No
Greater London isn't in any county. It is its own Metropolitan Authority.
Greater London is the area in and around London City itself.
In the borough of Merton, Greater London, England.
Greater London was created in 1965.
UK telephone area code 020 is greater London. A number beginning with 020 8262 could be located anywhere in the greater London 020 area; that prefix is not associated with any particular borough, district, or neighbourhood. Furthermore, with number portability, any 020 number could be located anywhere in greater London, served by any local telephone company.
Greater London and the City of London which is a semi-autonomous region within Greater London.
The Greater London Region is governed by the Greater London Authority The City of London is governed by the City of London Corporation
Greater London Authority was created in 2000.
Greater London League was created in 1964.
The Tower of London is in Greater London and not in any particular county unless you mean 'country', in which case it is in England, which is part of the United Kingdom.
Greater London
Trains are locomotives and carriage's in any Country. London is no different. There are also Underground trains in London.