A train rumbles along the tracks at high speed. After it passes, the rail feels hot. What kind of energy transformation took
place?

Mechanical --> Thermal

Explanation:

i won't lie i don't know so go online and ask google thats what i do

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.