Because its impossible to do a decent hammerjump, you cant like on hispeed, get on the roof of that crossing section
yeah u can fusion m8 Trouble is, what to do once ur up there...
U can also hammerjump to the higher lil nest bit on the side of the main wagon but ur kinda stuck there... and likely to get ripped to shreds from the defenders cannon turret thing. Far too linear this map. Cept the end bit where u can jump on the lil car and get into the missile bit from the side as well as attack normal way, thats a nice touch.