i know about the existence of abandon stations but i haven’t heard of a whole subway line abandoned! i can’t really find anything else from a quick google search. sorry!
that's fine thanks for trying though. I just found the video I heard it from and it's aparantly on Staten Island and was abandoned and replaced in the 50s. here's the video btw: https://youtube.com/shorts/BuEGtEWmmLk?si=RDmn1i3_rPJ541nl