Hit Entertainment have removed the recent full episodes of Thomas and the Billboard and Steady Eddie from YouTube.
The company uploaded the complete US versions of the Season Twelve stories onto the video networking website last Friday in early April.
They have since been mysteriously pulled and privatised with no explanation given.
When the pair were available to watch in its HD glory, this led to a positive reaction from fans who were pleased with the move.
Full opening and closing titles appeared alongside Michael Brandon's narration as was The Island of Sodor intro and the Engine Roll Call music video, in both videos.