Sprint Series of Texas rained out at Waco _Front Page News, Sprint Series of Texas Waco, TX — (March 20, 2015) — The Sprint Series of Texas event scheduled for Friday at Heart O’Texas Speedway was cancelled due to rain. The SSoT series moves next to Boyd Raceway on Saturday April 4th. Related Stories: Pot of gold full of water at Bronco Raceway Park Red River Speedway rained out Southern Outlaw Sprints weekend washed out Lincoln Speedway opener rescheduled for March 14th Brisbane Rained Out Heart O' Texas SpeedwayRained OutSprint Series of Texas