The previews surfaced on the King of the Railway minisite this week on the Explore Sodor campaign.
The first, set at The Steamworks, shows the moment Stephen is first introduced, much to the interest of Thomas, Percy and James when the newcomer contemplates his elder state.
The scene's soundtrack was used as the music for the Spruce Up Stephen game earlier in the month. Alongside the incumbent, Thomas and The Earl of Sodor, Connor and Caitlin also appear on the Ulfstead Castle portal.
Their clip sees the two Mainland engines' arrival on Sodor, with Hiro, James, Gordon and Spencer astonished at their speedy entrances.
Walmart provided a glimpse to another clip earlier this week with Spencer challenging Gordon to race.
MEET THE NEW ENGINES AND EXPLORE ULFSTEAD CASTLE ON THE 'KING OF THE RAILWAY' MINISITE