Is there any way i can travel to kashi or kashgar through these train or anywhere near it

If you check on the map, you will see there is no high speed rail service in Kashgar at all. For the Northwest part of China, only one route for hi speeds-Lanzhou to Urumqi. If you do not want to take a flight for the trip, you may think about go from other city to Lanzhou first by slow type and then a fast ride to Turpan or Urumqi and finally slow type to Kashgar.