http://www.atu583.com/Resources/resources.htm
That doesn't help much but it has some information. I don't think we have to worry about a complete shutdown of service any time soon. One thing they might do is just not wear uniforms. That probably won't last long because, umm, who cares?
If they have a strong mandate they might actually give up this work-to-rule thing they are doing now and take the overtime. That sounds good but on the other hand, part of the reason to do that is because they might need the money if they do strike.