However, the tracks of the Loop 'L' were operating at capacity during rush hours, and could not handle the additional train traffic needed to satisfy demand.

With changing traffic patterns and increasing use of automobiles resulting in lower train frequencies, CTA was able to end 'L' service to the terminal late the same year.

On February 25, 1951, all Milwaukee (Logan Square) trains were rerouted into the new Milwaukee-Dearborn Subway, with all Humboldt service to a shuttle operation to Damen.

The Chicago Aurora and Elgin continued to use the terminal, though a problem loomed as plans for a new superhighway — the Congress Street Expressway — called for the road to be built on the route of Garfield Park 'L', necessitating the demolition of the elevated structure.

Though the plans included a new rapid transit rail line in the median strip of the new highway, connecting with the Milwaukee-Dearborn subway, and though a temporary right-of-way was established to allow rail service to continue during construction, a number of operational and political obstacles led to the interurban deciding to change their service to the outer terminal of the elevated line at Des Plaines Avenue in Forest Park.