There has been a thread running from a previous post about the history of the CFD Hazardous Incident Team apparatus 5-1-1. Here are several photos which describe the changes over the years.
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Prior to becoming a full-time haz mat unit, this 1979 Chevy Stepvan (G-418) was used for haz mat incidents. This unit, with a signature of 4-7-5 was assigned to the Emergency Preparedness & Disaster Services. Bill Friedrich collection.
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An image of Flying Squad 4 with their 1970 Mack MB/Platt unit which was identical to the unit that was later reassigned to HIT 5-1-1. Larry Shapiro collection
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This shot is of Flying Squad 1 at the CFD shops prior to being repainted for 5-1-1. Bill Friedrich collection
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1970 Mack MB/Platt (G-306) formerly saw service as Flying Manpower Squad 1. Bill Friedrich photo
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Another shot of the Mack/Platt unit by Larry Shapiro
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The first unit purchased specifically for the full-time HIT was this 1990 Spartan Gladiator/Saulsbury (G-492). Larry Shapiro photo
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Chicago now staffs two full-time Hazardous Incident Teams that use identical rigs. Karl Klotz photo