Propaganda in the education car indoctrinates children from a young age to believe that the engine is eternal, with songs lyrics like: "rumble rumble, rattle rattle, it will never die! What happens if the engine stops? We all freeze and die!" (Snowpiercer 1:09:44). The scene of the engine room, however, reveals that the engine itself is the opposite of what all the propaganda entails; instead of an eternal preserver, the engine is a regular machine that requires manual labor when it breaks. This labor is provided by none other than the small children of the tail sectioners, who are taken against their will to replace the broken parts of the engine. The process is horrifying to witness, as the audience must see the tail child, Timmy, be forced into a cramped compartment underneath the engine room and transformed into a cog of the engine. Wilford explains his reasoning for exploiting innocent kids very nonchalantly by saying “oh, the space only allows for [...] young children under five” (Snowpiercer 1:50:53). Essentially, the use of children as a mechanical part represents the ultimate form of dehumanization in the film.
Joon-ho is able to show this dehumanization through his use of a close-up camera angle. Close-ups can create the specific effect of "objectification," or the process of turning a human into an object, when zooming in on parts of the human body (Frost 158). For the engine scene, Joon-ho uses a close-up camera angle to frame and isolate the child's hand from the rest of his body, thereby effectively objectifying Timmy as less than a human being -- only a hand exploited for the labor it provides (Snowpiercer