I think it is to disconnect the train from the track before the big drop. Maybe even to add to the suspense as well. These are my two guesses.
-------------
Parks hit for 2000!
PKD,BGW,DP,HP,PKI,HW,SFKK,SFA,SFNE,LC,GE,QP,Camden,Lakemont,Knoebels, SFO,CP,