SP cited low ridership during the winter .
SP asked the Interstate Commerce Commission ( ICC ) to allow the Shasta Daylight to run tri-weekly between September 15 and December 14 and again from January 15 to May 28 .
Citing low ridership during the winter , SP asked the Interstate Commerce Commission ( ICC ) to allow the Shasta Daylight to run tri-weekly between September 15 and December 14 and again from January 15 to May 28 .