Here are some pictures of stations and signs as they were in the 1940s or earlier. It is interesting to see the languages used in some of the signs, as these places are now in Pakistan
First, Karachi Cantt in the 1940s (from a film shot by a British soldier):
Lahore, probably 1940s:
Landi Khana. This is truly a rare picture, as it could have been taken only between 1926 and 1932. Note the Gurumukhi script.
Landi Kotal, probably 1930s:
Shelabagh, close to Chaman on the border with Afghanistan and not too far from Kandahar. Note the southern end of the Khojak tunnel:
And finally Tanduri, on the now-closed Sibi-Khost section. It appeared in the 1891 timetable and never again. Perhaps the extreme heat gave it its name and hastened its closure:
(This picture seems to have been taken in 2009). The sign does look to be a century old.
Finally, this is what you would see while entering British India from Afghanistan at the Khyber Pass border checkpoint in the 1930s:
It is easy to guess that the milestone refers to Peshawar, Jamrud and Landi Kotal. The station of Landi Khana was still closer to the border. It appears that an embankment and maybe rails were laid from there to the border, but trains never ran on them.
And when you tried to cross into Afghanistan at other points on the border, you would see this: