Chp uhf-2 south 460.375

question I listen to chp uhf -2 analog pl127.3 I here union pacific police a lot talking on it and I hear call sign d.m.v on there who are these guys it very busy sunday they were running liscense checks on plates well as people.i live in Compton I right near the railroad tracks I do here union pacific police and bnsf I see them a lot patrolling alameda well as private security and input on this would be appreciated