You can board the train at both stations.
The Vintage bus runs all day from epping station.
Heres the Bus timetable.

Epping departure times 11.00 12.00 13.00 14.00 15.00 16.00

North weald arival times 11.15 12.15 13.15 14.15 15.15 16.15

North weald departure times 11.40 12.40 13.40 14.40 15.40 16.40

Epping arrival times 11.55 12.55 13.55 14.55 15.55 16.55
The bus price is included in the ticket.
More retail is avalible at North weald
and soon to have refreshments.
Ongar Has a canteen and bigger retail.
Its a great day out so come down and have a look around
James
Offical website www.eorailway.co.uk
History of the line www.eorhistory.co.nr