An alternative plan was devised in the 1970s to extend the Jubilee line parallel to the River Thames: this would have taken the line from Fenchurch Street to Thamesmead via St Katharine Docks, Wapping, Surrey Docks North, Millwall (near to South Quay DLR station), North Greenwich, Custom House, Silvertown, Woolwich Arsenal, and thence to Thamesmead.
La linea venne estesa a Stratford con dieci stazioni intermedie.