которой или которые?
"В метро есть кольцевая линия, через станчии которой проходят радиальные линии."
This is one sentence on my test book, I'm confused about which case is the word "которой" in? My guess is the "которой" refers to the word "станчии" as stations but if this is the case I can't make sense why it's not "которые" (accusative case, plural)
спасибо за внимание