This from Kevin Griffin:

Some time in march the Lisle Woodridge Fire District will changing numbers. This is to fit in with ducomm switching to the CAD system. Station 1 will have Engine 51 Medic 51 Truck 51 and the battalion. Station 2 will have Engine 52 and Medic 52. Station 3 Truck and Medic 53. Station 4 Medic and Engine 54. Station 5 will have Medic 55  and Engine 55 along with Medic 56 and Engine 56 (the reserves). I’m not sure what the dive squad and the boat are going to be but i thing it is going to be Squad 52 and 52A. They are renumbering the Districts as well again i don’t know all the numbering.