Yes, if there is a mid-course, the train can make it back from a complete stop. I was stopped on Viper (SFMM) and the train absolutely limped through the remaining 4 inversions. It was kind weird, but in a fun way.
Goliath now almost stops every single time at the midcourse, but it has PLENTY of speed for the second half.
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"X" marks the spot in 2001!