From a previous post...
On the vehicles:
8xx = ALS
9xx = BLS
On the radio:
2384 = BLS 984 out of 23 station
ALS add 40 to station number, so 6384 = ALS 884 out of 23 station
The 8xx and 9xx being ALS and BLS doesn't hold true anymore. There are also 4xx and 5xx units. Previously, 5xx units...