Deletion of Sydney underground railways

Comment: the information is mostly duplicated at Railways in Sydney#Underground sections and Railways in Sydney#Disused tunnels. The only question here is: Should this info remain at Railways in Sydney and the subject of this AfD be merged/redirected to there; or should the info be |splitted to this article, and the two sections at Railways in Sydney have only a short sentence and a "main article" template directing the reader here. Please comment
Stance: comment
Cited policy: Wikipedia:Article size (WP:SPINOUT)