Good catch. Interesting reading. Graham Garfield knows his stuff when it comes to anything related to the L.
However he did make a minor error-
"By 1984, the tracks were only in service as far north as Belmont Avenue. At that time, the remaining customers were a fuel oil company on Racine Ave., the Reed Candy Company, the Hostess Bakery, and the Peerless Confectionery Company."
The fuel oil dealer was at the SW corner of Racine and Newport, which is north of Belmont Avenue, so it could not have been rail served in 1984. In fact, there was a new building put up across the Milwaukee Road ROW between Melrose and School prior to 1984. The Milwaukee Road retained a stub of track north of Belmont up to Melrose for use as a tail track in switching Reed Candy.