A trein is a train. The first railroad in the Netherlands was opened in 1839, between Amsterdam and Haarlem. Other railroads quickly followed and by the end of the 1800s, passenger travel by rail had supplanted travel by barge. Many emigrants leaving through the ports of Rotterdam, Amsterdam, or Antwerp took the train to the harbor.
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Yvette Hoitink, CG®, QG™ is a professional genealogist in the Netherlands. She holds the Certified Genealogist credential from the Board for Certification of Genealogists and has a post-graduate diploma in Family and Local History from the University of Dundee. She has been doing genealogy for over 30 years and helps people from across the world find their ancestors in the Netherlands. Read about Yvette's professional genealogy services.
Is there a link to find these maps online?
I found this particular map on Wikimedia. I don’t know of any websites specializing in Dutch railroad maps.