Ed,
Every terminal has some assigned jobs, from flat switching, which can be grueling or sweet, depending on your outlook…
There are trim jobs at hump yards, hump jobs, locals that run out and work nearby industries, yard to yard transfer jobs, or “turns”…all bid on.
Some jobs can be done quick, you finish and go home, some jobs can be made to drag out all 12 hours, a lot of how desirable a assigned job is depends on the crew and what they want, lots of overtime or a quit every day.
If your terminal is not much more than a crew change point with a few yard tracks for RIP and a small set out, then most likely it is a pool service system there, not much to bid on anyway.
Remember, as several of us pointed out, a whole lot of the how and why stuff is determined by the local agreement between the local union chapters and the carrier.
Assigned jobs are created by the carrier.
They create jobs to fill certain needs, and can abolish them at will.
Most terminals have a set lead jobs or two, and often a customer may see an upturn in business, requiring a second or third plant switch, so the carrier will create and post for bids jobs to fill such requirements.
On my road, jobs work in shifts, first second and third, and are numbered accordingly, so my jobs, 152, is 1(first shift) 52, 52 being the lead job south end North Yard…job 252 is second shift, so forth and so on…any of our jobs that start with 1** will be a morning or daylight job.
UP uses something close to this here for yard jobs and yard to yard transfers…EW160 EngleWood 1st shift yard to yard from Englewood to PTRA and EW260 is the same job but in the evening.
Through train, or symbol trains are the same, they are created by the carrier, the crew make up is offered up for bids by seniority or made up from pool service crews…
Technically, I work for the UTU, under contract to the