The festive episodes The Missing Christmas Decorations and Santa's Little Engine were held back after the Down Under run ended on November 1st.
The two are to now be broadcast on the same day before Christmas Day. The Missing Christmas Decorations' synopsis reads; No one knows who is taking the Steamies' Christmas decorations from Tidmouth Sheds.
Until Percy discovers Diesel 10 stealing them and chases him back to the Dieselworks, where he also discovers poor forgotten Sidney.
Santa's Little Engine's reads; Thomas is sent to bring a real sleigh for the Fat Controller to ride in when he plays Santa at the Ulfstead Castle Christmas Fair.
When the sleigh slips down the hill with the Fat Controller in it, Thomas has to rescue him!
The final two episodes of Season 17 debut in Australia on ABC2 on Christmas Eve at 3pm and 3:10pm respectively.
Thanks to Thomas Stansfield for the alert.