California Code, Public Utilities Code - PUC § 101346

The district shall not acquire any existing system or part thereof whether by purchase, lease, condemnation, or otherwise, nor shall the district dispose of or lease any transit system or part thereof, nor merge, consolidate, or coordinate any transit system or part thereof, or reduce or limit the lines or service of any existing system or of its system, or terminate any lease arrangement or management contract, unless it shall first have made adequate provision for any employees who are or may be displaced.  The terms and conditions of such provision shall be a proper subject of collective bargaining.