The train station for London City Airpot is merely 50 meters from the London Docklands Light Railway (DLR) station. The DLR departs the London City Airport station every 8 to 15 minutes for Canning Town (7 minutes away), Canary Wharf (18 minutes away) and Bank (22 minutes away). You can use the Travelcard and Oyster Card.
Docklands Light Railway
Photo Credit: Oxyman, GNU Free Documentation License