Enfield Lock railway station is in the London Borough of Enfield in north east London , and is in Travelcard Zone 6 , on the Tottenham Hale part of the Lea Valley Lines , on the West Anglian Railway . Enfield Lock railway station is in the London Borough of Enfield in north east London , and is in Travelcard Zone 6 , on the Tottenham Hale branch of the Lea Valley Lines , on the West Anglian Railway .