The line through Fratton and into central Portsmouth was laid on the abandoned dry canal bed of the unsuccessful Portsmouth and Arundel Canal, which was opened in 1823 and closed in 1827, after seawater from the canal contaminated some of Portsmouth's fresh water wells. In 1845 parts of this section were sold to the Chichester to Portsmouth Branch Railway company with another section being sold to the company in 1851. The former canal walls are still clearly visible between Fratton and Portsmouth city centre today.