Not totally true for package car.
This is from article 26 NMA. OP, this may answer your questions as well.
Section 5. DOT Hours of Service
The Company shall not change the DOT sixty (60) hours in seven (7) days to the seventy (70) hours in eight (8) days rule for package drivers except at Peak. With prior approval of the Company’s President of Labor Relations and the Teamster’s Package Division Director, the DOT standard may also be changed if required due to Acts of God or emergencies creating service disruptions. When the Company changes the sixty (60) hour rule it shall first solicit vol- unteers to work in excess of sixty (60) hours from all package car
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Article 26
drivers in the center. If sufficient volunteers cannot be obtained to cover the over sixty (60) work hours, the Company will first force seasonal package car drivers, non-seniority package car drivers, part-time cover driver classifications and, then Article 22.4(b) drivers. Seniority package car drivers will only be forced after exhausting the seasonal, non-probationary drivers force process, part-time cover driver classifications and Article 22.4(b) drivers. No regular package car driver red circled under Article 22.4(b) will be forced to work on a day off and exceed sixty (60) hours unless he has a full eight (8) hours of duty available. Any regular or Article 22.4 package car driver who volunteers or is forced to work over sixty (60) hours in a week pursuant to this paragraph will be compensated at double-time for those hours. This para- graph supersedes any provision in any Supplement, Rider or Ad- dendum which addresses this subject. This Section is not intended to give the Company the right to force seniority package car driv- ers to work on a weekend unless permitted by the applicable Sup- plement, Rider or Addendum.
In other words, if your building hasn’t approved a 70 hour week, then you can’t be forced in. If they have you’re gonna get double time all day today so take your breaks, work safe, and jam it straight up their asses.