It is not possible to evade your fare either on the national rail system or on the Underground. There are barriers and cameras everywhere. Romford is within the London zones. Save money by purchasing a Pay As You Go Oyster Card
www.tfl.gov.uk
www.nationalrail.co.uk
www.16-25railcard.co.uk
Forget it. They ALL have barriers. If you don't have money, don't travel. It's not fair on the rest of us that you commit theft.
You're asking advice on how to commit a crime ? Er, no.
Moron. You are asking for help on how to commit a crime.
Everybody else has to pay. Why should they subsidise you?