North Cheam
... that the Northern line, which already served the southernmost station on the London Underground, was proposed to be extended southward to North Cheam in 1946?
... that the <a href="./Northern_line" id="mwCIU" rel="mw:WikiLink" title="Northern line">Northern line</a>, which already served the southernmost station on the <a href="./London_Underground" id="mwCIY" rel="mw:WikiLink" title="London Underground">London Underground</a>, was proposed to be extended southward to <b id="mwCIc"><a class="mw-redirect" href="./North_Cheam_tube_station" id="mwCIg" rel="mw:WikiLink" title="North Cheam tube station">North Cheam</a></b> in 1946?