Chicagoland area only has 2 tillers, Cicero and Evanston. Chicago got rid of theirs in the late 80'sI know a lot of departments are actually going to more TLs because of the added compartment space. I know at least 3 departments in this area (Louisville Kentucky) have gone from RM to TL for this reason.
Tillers are widely used, included with the examples noted above, the DCFD has mostly tillers. The FDNY has maintained its fleet of 13 for many years. The only variation I am aware of, L6 went from a tiller to a RM, back in early 90's. When L6 got a New Captain, he requested to go back to a tiller. Since then there has been no change, that I'm aware of anyway.
Correct about 151 and 173; also about Ladder 6 which was a rear mount for a while in the mid '80s and early '90s for some reason in the narrow streets of Chinatown before going back to a tiller.Weren't 151 and 173 tillers well into the mid-90's? I could be wrong but I thought when I worked as a medic in Queens from 92-97 that 151 was a tiller then.