It's the same job, essentially. But you will be employed by southern, and work the panel for their depot.
It's simple enough, you signal the trains, and that allows them to move them around the depot. I imagine it's a NX panel, so you push one button (eNtrance), and press the next signal where you want it to go (eXit), and away they go.
I wonder how much rules and regs them guys learn
Edit: It's not an NX panels, it's this!