In my limited experience both the DH8 and BAe146 have elevators that can be split. This way, if one jams, either insitu or has a fouled control run, the remaing elevator can be disconnected to maintain a level of control.
I was told some time ago that the Fokker 50 was really a variant of the F27 as it didn't have split controls (being a 1950's design) and had it not been certified as an F27 it couldn't have been certified as a new type in its own right.