Apart from the North Western Railway, the Jodhpur State Railway was split between India and Pakistan after Partition.
From a Bradshaw of 1944, we see that JoSR covered in four pages:
Readers from India will be familiar with the extensions and conversions on the Indian side. The lines which went to Pakistan are highlighted on the first two pages.
The line from Hyderabad to Mirpur Khas was converted in the late 1960s, and further to link with the Indian BG system in 2006. A new station (Zero Point) was built exactly on the Pakistani side of the border, between Khokhropar and Munabao.
The Thar Express covers the stretch from Munabao to Zero Point, with connecting points to Bhagat-ki-Kothi (near Jodhpur) and Karachi plus intermediate stops at Mirpur Khas and Hyderabad.
The other metre gauge lines shown in the first two pages were never converted and appear to be closed. A PR timetable of the early 2000s showed weekly trains on the Pithoro loop and one every 15 days on the Nawabshah branch.
The line to Zahidan has around the same frequency, but it still survives in the hope that one day it will be useful for Pakistan-Iran trade.