Weird atmosphere throughout!
I've seen The Polar Express many times and am always struck by the very weird, almost other-worldly--atmosphere. Everything seems so somber, from the way the kids look, to their interactions, and even the lighting of the big tree and Santa taking off in his sleigh. Just something "off," and I can't quite put my finger on it...but I like it.
The ending always gets me right there. So sad that all his friends and family could no longer hear the bell. I'm happy to say I still do!