65 ILCS 5/11-121-6
Without any petition or consent of any property owner, a municipality has the power to lay down and construct in such subways, railroad and street railway tracks and all necessary appurtenances and operate the same for transportation purposes. Likewise, without any petition or consent of any property owner, but subject to the provisions of Section 11-121-7, a municipality may lease, consent to, permit, or grant the use of such subways, or portions thereof, for transportation purposes, including the right to pay down, construct, and operate railroad and street railway tracks therein, to any political subdivision, municipal corporation or public authority of this state authorized to construct and operate transportation facilities or to any railroad or street railway or other local transportation corporation upon such terms and conditions as the corporate authorities of the municipality by ordinance shall prescribe and for such duration of time as may be authorized by any law of this state governing the grant of permits for local transportation purposes in the streets of the municipality. The municipality may also use the subways or lease or permit the use of the subways for transportation facilities other than railroads and street railways, and to the extent that the subways are not used for transportation purposes, the municipality may use the subways, or lease or permit the use of the subways, for the purposes.
65 ILCS 5/11-121-6