I have a question about the meaning of "*line*" in this [news article](http://www.telegraph.co.uk/news/2016/07/18/german-train-axe-attack-many-injured/):  


>The Wurzburg attack was on a train travelling from the Bavarian town of Treuchtlingen to Wurzburg, which is about 60 miles northwest of Nuremberg. The ***line*** was closed.  

I don't get the intended meaning of "*line*" in the article.  Dictionaries suggest two possible definitions:  

>1. a system of transportation, including ships, buses, trains, etc.    

>2.  a railroad track, usually as part of a larger railroad network


Both definitions seem to fit the usage in the news article.  Which one should be used then?