A train on tracks, carved delicately out of graphite pencil lead, emerges from inside a carpenter’s pencil …

More details at Colossal and Laughing Squid.
Yes, there are other proponents of this art, see for instance Dalton Ghetti and Cerkahegyzo.
As someone who can’t even sharpen a pencil properly by hand (just one of the many things which made my woodwork master tear his hair out), I find these absolutely incredible.