There is a train! Golmud to Urumqi! Then why didn't Urumqi go to Golmud! I can't justify it

If the road condition is bad, there must be no ++

There is indeed no direct train from Urumqi to Golmud. It is recommended to transfer in Lanzhou. <br/>1. Z323 stops at 09:27 19:24 Lanzhou passes Golmud 9 hours 57 minutes<br/>2. Z917 stops 11:16 20:48 starts Lanzhou passes Golmud 9 hours 32 minutes<br/> />3. Z21 stops at 12:33 22:10 Lanzhou and Golmud 9 hours and 37 minutes<br/>4. Z265 stops at 16:50 02:40 +1 Lanzhou and Golmud 9 hours and 50 minutes<br/> />5. Z165 stopover station 18:34 04:26 +1 Pass Lanzhou Pass Golmud 9 hours 52 minutes