There was a few times that FDNY & Mt. Vernon worked the same fire for a building on the border line.
There was a fire on the border line that Mt. Vernon was using All-Hands, FDNY had a second alarm, & Yonker had close to a second alarm response all for the same fire. The location is Baldwin St. & Bradley St. You need to go into Westchester Co to get to that Bronx location.
Mt. Vernon FD has also been down sides over the years. They only have 4 stations & running with (I Think) 5 engines, 2 Ladders, & a rescue.
However, MT. Vernon FD was requested to respond to a Brooklyn Fire many years ago. FDNY did not have any foam units at the time & because of 'Oil City' located on the Bronx, Pelham, Mt. Vernon border line, Mt. Vernon had a foam rig. Well Mt. Vernon responded under NYPD escort. The Sgt. on duty at the Tri-Boro Bridge would not permit the fire truck to use the span without paying the toll.
This is a true story!!!!!