Once the Romans had built the first London Bridge, that effectively ended any possibility of large ships going further upstreamm. However, the newer London Bridge was less of an obstruction, and seagoing colliers (the "flatirons") could get to most of the Thames side power stations, certainly as far as Fulham, and possibly even Kingston if they could fit into Teddington Lock. Fulham was as far as the flatirons went. Kingston was served by lighters (barges).