Tom Anderson wrote:

However, that link might be useful, as part of the NR network, if a
some other bits of track could be constructed - a link from Epping to
Harlow would allow trains to run from the GEML up to Stanstead and
Cambridge (although an extension of the Braintree brach might make
more sense),

Especially since the original trackbed from Braintree to Bishops Stortford
is AFAIK entirely still there, apart from the bit which was converted to the
old Great Dunmow Bypass, which road has been rendered pretty redundant by
the new A120.