I rebuilt 60052 into a different train with different cargo and vehicles, using only parts from the original set (excluding extras). I'll share the instructions at some point, and maybe try another
LEGO City Cargo Train 60052 Train Instructions Book DIY 2 - YouTube
Manual Lego 60052 (page 1 of 72) (All languages)
Cargo Train 60052 - LEGO® City Sets - LEGO.com for kids