Somebody correct me if I'm wrong, but if you leave Small Package to go to another branch of the company you lose any seniority that you may have.
In situations where a direct transfer is not possible, my understanding is that you generally have to quit Job A and then apply for Job B.
As far the Tractor Trailer Driver position, that's an SCS job. Whereas Freight can be long-haul between terminals or city with multiple stops and have some degree of routine, an SCS Trailer driver would likely be go to point A then B then C then D, never to come back to points B or C again. More the contract driver type gig.
For SCS you'd be hauling anything they couldn't get inside a Semi or as I mentioned Containers or Flat Beds.
It depends on your supplemental agreement. Here, most feeder drivers were former part-time employees that only had a Class A license, and little experience. We were hired full-time first due to contractual hiring ratios and our seniority over casuals. And, this is a good thing because it honored our seniority regarding full time job promotion.
But, if any full time employee gets their Class A license, the company is obligated to train them at two different time periods per year, if these employees turn in a letter of intent. Once qualified, they can bid on any open job in the feeder classification.
It is important to note that there is no starting over after bidding here. By that, I mean that if a delivery driver goes into feeders, they carry all of their seniority with them, not start at the bottom. At some places, if a delivery driver bids to feeders, they are dove tailed at the bottom, regardless of their total seniority. This way takes away our most coveted right; seniority. Rules like this only prevent senior employees trying something new, protecting the less senior employees. I hope you guys in Jersey get it fixed.
The bottom line is that hiring practices differ depending on where you are geographically.