Bob Bean (right) is among the union protestors at Central Station this morning.A dozen or so light rail operators protested at the Central Station in downtown Phoenix this morning, holding hand-made signs that excoriated both Metro Light Rail and the Boston-based company that manages the line, ACI.Carrying colorful poster board with slogans including "Metro Rail, Thanks for the Unemployment" and "ACI-Metro Rail Lured Us with Lies," the workers handed out leaflets to riders using the stop.New