Sometimes, I like to take an official LEGO set and ignore the instructions to see what I can come up with. Here's a steam locomotive made of some parts in 60052. :
Cargo Train 60052 | City | Buy online at the Official LEGO® Shop US
LEGO Cargo Train Set 60052 Instructions - YouTube
King 82008 Cargo Train (Previously known as Lepin 02008) – Big Brick Store