It's an awesome trian that get you anywhere in Tehran. If you arrive between 6 am and midnight it's definitely a must go, no traffic, clean, very very cheap ( 25 cents)! I will attach the schedule of the train as a photo. It takes exactly 30 minutes to Aftab station where you have to change the train. From there you can get to the heart of Tehran in half an hour or so.
The only recommendation that I can make is to increase the frequency of trains and the speed of the train. It seems the whole line is new and drivers are conservative about speed.
This station offers a very convenient way to get to almost everywhere in Tehran. Line 1 crosses all other seven lines. You can buy a single ride ticket at the station. Make sure to keep the print for the exit.