The terminus was built

after considerable negotiation

with the Board of Ordnance,

which argued that the site, just outside

a main gate in the Gosport Lines ramparts,

could compromise the Portsmouth Harbour defences.

The buildings were designed to be defensible,

with surrounding railings and a roof parapet.

The terminus was designed by  William Tite

in an Italianate classic tradition and finished

with Tuscan columns with Corinthian capitals

and an overall wood and glass ‘trainshed’ roof.