Location: Hallett Tower, Ohio

Hallett Tower controlled the crossing of the Toledo Terminal main double track belt line and the Ann Arbor/PRR main line north out of Toledo. Hallett also controlled several lines which joined at this location, including the Michigan Central line north to the new North Yard and Vienna Junction, the Pere Marquette line north to Monroe and Plymouth, and a connection between the AA and MC's new North Yard.

Hallett remains the only staffed interlocking tower in the Toledo area and the operator acts as dispatcher for the Ann Arbor Railroad's line between AA Ottawa Yard and Osmer, north of Ann Arbor, Michigan.