70 ILCS 1545/7
In the event the classified civil service of the city or park district exempts from its provisions positions held by any employees transferred hereunder, the employees so affected shall be assigned a position in the classified civil service as nearly comparable in responsibilities and duties to their former employment as it may be possible to approximate.
(from Ch. 105, par. 333.57)
(Source: Laws 1957, p. 1075.)