Great image! Detroit must have had a pretty sweet Police Dept. budget to be able to purchase so many new '37 Fords at one time.
I have a photo of 10 (from memory it was ten) brand new '37 Fords parked side by side in Hamilton NZ, all owned by a taxi company
Hopefully heat but no AC, no auto trans..Maybe heavier springs and the adjustable Houdailles dialed up with conditioned air from opening windshield...