1. Go to Timetables and Spawn Walking at Hagen Hbf at 07:25.
2. Within a minute a train will pull into the station at 07:26 to the east of where you spawned.
3. Get into that train as soon as it stops and go to the driver's seat and press
to take over
4. Confirm that you want to take over the service
5. Wait for the Load Passengers circle to fill about 75% of the way and pause and Save
6. Finish the service and quit to the main menu after
7. Select Last Played from the main menu and keep repeating steps 6 and 7 until the achievement pops.
The tracker does not work for this achievement so you will have to keep track manually if you want to know how many you've done and how close you are to 50.
You can also keep going until you’ve done it 143 times and unlock this achievement as well.