A day early from its broadcast, Percy's Lucky Day was previewed on the channel with a minute long teaser almost an hour after The Phantom Express was shown.
It shows Percy mistaking a man's green hankerchief for a signal to leave with the mail run from Wellsworth Station.
The scene makes a reference to Season Two's Wrong Road, recollecting the moment a woman's green hat misleads Gordon to leave with the express.
Bill and Ben are to make their returns in the new installment as evident by one of the twins' whistles being heard briefly at the end.
Thanks to SteamTeam for the alert.