California Code, Revenue and Taxation Code - RTC § 11651.5

If the board for any reason fails to complete the private railroad car tax assessments by the time specified in Section 11336, it may nevertheless complete them within the next calendar month. In such case there shall be added one calendar month to the dates specified in Sections 11337, 11338, 11401, 11404, and 11405. The board shall notify each assessee by mail at his address as it appears in the records of the board of the substituted dates during which the assessment may be examined, a petition for reassessment filed, and the tax paid without penalty.