My understanding is that the Santa Clara County Fire Chiefs association decided to have all apparatus renumbered in the county so that there will not be any duplication in numbers. This is supposed to be effective January 1 2014. With the new numbering there will no longer be a need to state the city and apparatus number when responding on mutual aid, or auto aide calls within the county. In other words if San Jose engine 14 is responding on county fire primary to an auto aide call they will no longer have to say San Jose engine 14 during a transmission, they can simply say engine 14, and everyone will know its a San Jose engine. Over all this should make radio traffic flow a little smoother.
This is another example of the more things change the more they stay the same as this is pretty much how it was in Santa Clara County many years ago. If my memory serves me correctly, Milpitas FD was the 80's numbers, Mt View was the 50's, Sunnyvale the 40's, Los Altos the 70's.
It will be frustrating for all concerned for awhile. Old habits die hard. I'm sure we will hear lots of wrong apparatus numbers being used for awhile. Truck 5 County Fire, Oops I mean Truck 85 County fire!