Its not the elements, the idea of "Laying track infront of a toy train" is a pretty obvious idea. What makes the Wallace and Gromit scene so classic is the direction - by which I mean camera angles, camera movement, edits, and the 'acting' which are all akin to a hollywood action sequence but (somewhat absurdly) set in a claymation world. Think about the part where gromit goes under the table -

- you see gromit glance up, his eyebrows communicate that he's seen something challenging

- shot of table approaching, an impossible forest of wooden legs

- shot from the side of gromit (impossibly) finding a winding path under the table, brows furrowed but determined

- shot of wallace at the back of the train, from the side, following the same path

- shot from under the table, facing forwards, seeing our heroes continue into the room

That just one four-second segment of the chase. Its an absolute masterclass of editing and camera angles. And its also impossible, but it makes sense to the viewer.

Also, consider that of the three characters in the chase, only one can talk. Gromit expresses everything with his eyes and body language. And the penguin has barely any facial expression at all, just two black eyes. Mostly the penguin's emotions are expressed through neck movements. But nonetheless he's a classic antagonist.