I know that some of the plants/buildings use one of the two trunked systems in the R.R. Database, and others use conventional frequencies.
Ford Security and Ford Fire at the Rouge are on 451.475 (Ch.1) and 451.275 (Ch.2). They share these channels with World Headquarters Security, Research and Engineering Security, and Ford Grounds Security in Dearborn. All stations are dispatched by Ford Security Central Station at R&E. Dearborn Fire, Allen Park Fire, and SeverStal Security (Rouge Steel) will use channel 1 to communicate with Ford when necessary.