Giraffes

The Giraffes are constantly seen in the back of the Birthday Train throughout different segments of the 1991 film and the Tom and Jerry version.

1991 film
They are first seen walking up to the back car of the Birthday Train and Grumpella declares that they will never fit in there until they duck down and make it into the back successfully proving her words wrong.

They are then seen always being in the back of the Birthday Train in the same car they were in, and then they are seen dancing to the music of Nothing Can Stop Us Now and then are seen finally surviving the Avalanche at the end of the film.

Tom and Jerry version of the 1991 film
The giraffes stick their heads out of the roof of the Ghost Train's boxcar to get Tillie a attention.