Heard on the street. This is at least third-hand information, but I'm hearing something about the USPS having delivery supervisors (perhaps only 204Bs) supervise for 4 hours and deliver for 4 hours in an effort to cut costs and increase efficiencies.
Sounds good, but I see at least one problem, at least for my area (Dallas). Many of the 204Bs in Dallas that I've run across are Limited Duty.
On a similar note, some junior (seniority) supervisors in the Dallas area have already received RIF (Reduction in Force) notices, meaning they will be out of a job unless they find one within a certain time period. Currently, they're on their second-round of bidding. One six-year supervisor told me she was frustrated by the job hunt, because she is seeing a number of 204Bs holding down supervisory positions, with no promoted supervisors in sight. In fact, my post office has a promoted station manager, but two 204B Limited Duties that are running the place. I'm not sure exactly what's up with this, but perhaps these positions have a promoted supervisor assigned, but they are detailed to ad hoc positions.
These ad hoc positions were recently addressed by one of the postal supervisor union heads in recent testimony before congress. He talked of the cascading effect that detailed positions cause in the Postal Service. Detail a person, and that person's position needs to be detailed, and so on down the line. I'm wondering if the USPS will eventually put all of these managers and supervisors back in their original positions in an effort to curb management workhours.

