Another look at the neighborhood, this time from Wikimapia. Can’t say how reliable it is, though it does show the elusive places such as Kacha Garhi and Dakka.
Start from Peshawar Cantt and move west. The route of the Khyber Railway is shown quite clearly here, unlike in Google Maps.
Note the two pairs of reversing stations. The one between Landi Kotal and Landi Khana has not seen trains since the 1930s, and saw regular services only from 1926 to 1932.
Also reposting the basic map:

Next, we come to the planned narrow gauge line from Jamrud to Dakka across the border.
It is covered in this earlier post:
Whatever was done here, no traces of this narrow gauge line have been mentioned by any visitor. The construction of the actual BG line started soon after the 1919 war.
Then there was another abortive project to reach Afghanistan in the 1900s, which actually did see some BG track rapidly constructed and shut down equally rapidly in 1905-1907. That will be in the next post.