The train cars were really old trailers made into a train. (theyoungfolks.com)
The trailer is more accurately a variation of older trailers with added content, specifically these two trailers, Kingdom Hearts 3 (Partial) Trailer — D23 Expo Japan and KINGDOM HEARTS HD 2.8 FINAL CHAPTER PROLOGUE TRAILER. (squareelite.com)
Otherwise we get a collection of old trailers for Lionsgate releases of the past several years. (combustiblecelluloid.com)