Using the Train Supply Manager mod this is the setup for always calleing one train. A train in the station counts towards the number, so a new train is not called until the existing one departs.
by Unknown Author · updated 12/7/2018 · 10

Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Using the Train Supply Manager mod this is the setup for always calleing one train. A train in the station counts towards the number, so a new train is not called until the existing one departs.