Double-decker trains could be launched between Colchester and London in a bid to solve overcrowding.
Government transport chiefs are looking at the possibility of using the European-style trains on key routes into the capital.
The Department for Transport today confirmed double-decker trains were being considered for the Colchester to Liverpool Street line.
A Network Rail spokesman said: "We are supportive of any proposals to increase capacity on the rail network and are aware of the suggestion for double-decker trains. However, a great deal more research is needed."
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