Platforms 3 and 4 are the only ones remaining from the original Portsmouth and Southsea terminal station. There used to be more off to the left but most trains today run through to Portsmouth Harbour on the later high level platforms.
<a href="//commons.wikimedia.org/wiki/User:Geof_Sheppard" title="User:Geof Sheppard">Geof Sheppard</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>