Daring derail set problem....help!

Hi there,

New to the forum.  My 6 year old son is an AVID Thomas the Train fan and has many trackmaster trains and sets.  He also loves to take things apart .  One morning before waking us up, he found a screwdriver and took apart the the grayish/tan track piece of the Daring Derail set that has the explosion effect that pops up as he goes by.  I have tried to put it back together and I can figure out where almost all the pieces go on the inside, but it is not intuitive.  Would anyone be willing to unscrew the bottom of their own track pice and post a pic of it here??  My son really wants this back together and I can't find a schematic of this online anywhere.  Appreciate the help!