JB3, you look to mix different problems.
Airports : Sometimes, you have to split airports, think about military and civil airport at the same place. But, no one is splitting airports in wikidata... Perhaps there are wikis who separate terminal X and terminal Y, whatever.
Watford DC : do not confuse between physical line and commercial service. There are wikis who do separate. Apparently Bakerloo line is also sharing tracks with Watford DC line...
Principe pio : there are main lines, surburban lines and subway lines ==> some wikis do the distinction.
And you did input a nonsensical statements here https://www.wikidata.org/w/index.php?title=Q2527066&oldid=1673322722 : towards (P5051)=anticlockwise direction (Q6692036)
Please bear in mind that wikidata is about the singlest notable item, and that wikidata is not the end for many wikis (that is : editors in local wikipedias tend to reject wikidata and write plain text instead of wikidata data), and that a reality for one language might not bear the same reality for another language. Eg enwiki can be splitting a topic into different subarticles but another wiki might be simpler and mix topic into only one article.
Even nlwiki can be showing a parallel universum(Q2051667) ==> https://nl.wikipedia.org/wiki/Station_Ach%C3%A8res_-_Grand_Cormier lol