The race had to be restarted after a series of opening lap tangles.
For some years the industry was abandoned, but was restarted on a small scale in 1903.
Tryout assessments never use PIP, cannot be restarted and are not counted for licensing purposes.
The previous record since yearling entries were restarted for the premier classic in 1993 was 634 in that first year.
I usually just restarted the level at the last checkpoint.