Utah Code Ann. § 17B-2a-813
(2)
(a) Employees of a public transit system established and operated by a public transit district have the right to:
(c) Each public transit district shall:
(3) If a public transit district acquires an existing public transit system:
(a) all employees of the acquired system who are necessary for the operation of the acquired system, except executive and administrative officers and employees, shall be: