|Journey Beyond Realism|
|Air date||June 14, 2017|
|Thomas, Percy & The Pony||A Decade of Madness|
Thomas was on the Mainland having an adventure to see some new sights until he saw one of the Narrow Gauge Troublesome Trucks on the line making a good potty humor. Thomas stops just in time and asks the truck if he was okay, but the truck said "All I can see is another truck's backside!", so Thomas jumps on to a different track and heads on his way. He arrived at a small yard and backing next to him was an Cab-Forward Experimental Engine named Bertieberesufferfuffersford and starts talking, so Thomas decides to leave the Mainland and return to Sodor and runs off, leaving Bertieberesufferfuffersford all alone.
- This short marks Bertieberesufferfuffersford's first and only appearance in the series.
- From this short onwards, the engines perform non-static body movements when they speak or look in different directions, similar to Chuggington, Bob the Builder, and Pixar's Cars.