Firehouse 51 is the main Firehouse in the series and is under the command of Battalion Chief Wallace Boden. The location of the real quarters is Chicago Fire Department Engine 18, located at 1360 S. Blue Island Ave.
- Engine Co. 51 - 1995 Spartan Metro Star / Luverne (1500/500)
- Truck Co.81 - 1996 Seagrave Marauder (-/-/100' rear-mount)
- Rescue Squad 3 - 1989 Spartan Gladiator / 3D-Metals walk-in heavy rescue (250/150) (ex-Antioch Fire Department)
- Ambulance 61 - 2004 Ford F250 / MedicMaster Type I ALS ambulance
- Battalion Chief 25 - 2010s Ford Explorer
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