It provides passenger rail services on the London , Tilbury and Southend Railway line from Fenchurch Street railway station in the City of London to east London and the whole length of the northern Thames Gateway area of southern Essex including Basildon , Chafford Hundred ( for Lakeside Shopping Centre ) , Tilbury and Southend-on-Sea . It provides passenger rail services on the London , Tilbury and Southend Railway line from Fenchurch Street railway station in the City of London to east London and the entire length of the northern Thames Gateway area of southern Essex including Basildon , Chafford Hundred ( for Lakeside Shopping Centre ) , Tilbury and Southend-on-Sea .