Ask the all knowing KITTEHWARS!!!

@adorable

You clearly forgot to factor in magic, which in turn makes the smoke invisible to make the train easier on the eyes

 

@ethan

Brown, blue, green, red, or gray

 

@claudia

You apparently forgot the 'all knowing' part of my occupation title

 

@NP

Probably for the lulz

 

@NB* whoops

 

@NB

I can't be wrong, you simply are giving yourself the illusion of being correct.