Click On Your Trains To Set A Route, And You Can Add Stops At Train Stations Along The Way.
Have Your Train Drive To A Station Over 1000 Tiles Away To Pop This Achievement.
Pro Tip:
1. You Can Get This Achievement With Only A 501 Block Railway If You Add Loops At The Ends. (So Your Train Can Turn Around)
2. Afterwards Drive Your Train A Tad In Front Of The Target Station, And Tell It To Drive To The Station Right Behind It.
- It Will Drive The Length Of The Track And Turn Around To Get To The Station.
*Side Note*
Some Mods Disable Achievement Progression.
Good Luck!