Just watched this Bosco cartoon on YouTube. In this one, he's on a train with someone singing a song as that train goes up a really steep hill with some of the tracks missing. Then the train breaks apart with Bosco on the last one that disconnects and goes the other way. I'll stop there and just say there's quite a bit of unusual gags that you'll only find in these late silent/early talkie cartoons when animators were at their most cartoony, no matter how absurd they truly were. Like that "hill" becoming a person who pulls up his/her pants which causes the disconnected track to connect. Oh, and while Bosco adopts his "Mickey Mouse" falsetto here, when he says "Mammy!" in a dark place, you can bet some of his origins were in imitation of Al Jolson! So on that note, Box Car Blues is worth a look for anyone interested in these early animations.