This from Mike Summa:
Hello,This is Blue Island Truck 2104. It started as a 1951 ALF 85-foot Quint. In 1980, this was sent to ALF again in University Park to have a new Century cab installed. It was the first unit to have a white top, which is a Blue Island hallmark now. This was in service until 1997, when a new E-One tower was purchased, a remarkable 46 years of continuous service and durability. Enjoy!–Mike Summa