The next series of Thomas & Friends is currently in the middle of completing it's voice recordings sessions.
Asked by TheFattHatt1943 on cast member Ben Small's official YouTube Channel as to the current progress of the recordings, a query was made.
I'd expect by now that you've recorded Series 16. Stupid question, but, have you begun recording Series 17 yet?
To which Small gave a brief reply; Still on 16!!, next recording on June 8th!!
Season Sixteen is expected to air in Autumn/Winter time after the release of Day of the Diesels.