The main platform at Princes Risborough station. Trains to London Marylebone use this platform, as do through trains from London to Aylesbury but there is also a bay platform (currently occupied by 165020) which is used by branch line trains shuttling to and from Aylesbury.
<a href="//commons.wikimedia.org/wiki/User:Geof_Sheppard" title="User:Geof Sheppard">Geof Sheppard</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>