70 ILCS 1545/4
All persons employed by the park district upon the effective date as park policemen, or in boulevard maintenance and repair work, or in the investigation, study and planning of traffic on boulevards, who held such positions by virtue of the classified civil service under "An Act relating to the civil service in park systems," approved June 10, 1911, as amended, shall be transferred to the employment of the city and be given a civil service status under Division 1 of Article 10 of the Illinois Municipal Code, as heretofore and hereafter amended, without examination. Eligible and reemployment registers of the civil service board of the park district pertaining to such positions of employment shall be transferred to the civil service commission of the city and accorded the same legal status in respect to persons designated therein as if such registers had been established under the procedures of the civil service commission of the city. The Civil Service Commission of the city shall classify the positions of all park district employees so transferred and such employees shall be assigned to positions, so far as may be practicable, having duties and responsibilities equivalent to their park district employment. For the purpose of establishing the civil service status of park policemen transferred to the city, any rank above the rank of captain shall not be recognized. The civil service commission of the city may, in its discretion, cancel any eligible register of the civil service board of the park district transferred to it as has been in force more than two years.
70 ILCS 1545/4