Good on ya for trying to be informed.

Yes, as others have said the old contract is still in effect until a new one is agreed upon. As for contract enforcement, there is usually a 'grievance' process by which complaints can be filed for the union to bring to the attention of the company.

Some things that are important to your pay and quality of life may be in some contracts but not others. Some of these would be cancellation pay, trip/duty rigs, any pay multipliers based on hours worked per bid, etc.