Custom House for ExCeL station is in the Custom House area by the Royal Docks, east London. It is served by the Docklands Light Railway (DLR), and is in Travelcard Zone 3. It takes its name from the old Custom House, which formerly stood nearby, and the Exhibition Centre it serves.
The mainline station opened 1855, around the Eastern Counties and Thames Junction Railway, which eventually became merged into the North London Line, the service for which finished 9 December 2006.
The Wikipedia page is