The second shot is the old depot at Cambois a bit further up the branch.
I'm not sure what times the trains run these days but I think the basic pattern is as follows:
Tyne Yard - North Blyth (empty tanks)
North Blyth - Tyne Yard (loaded tanks)
Tyne Yard - Lynemouth (light engine)
Lynemouth - North Blyth (empty tanks)
North Blyth - Lynemouth (loaded tanks)
Lynemouth - Tyne Yard (light engine)
They usual seem to run whenever the trains are ready to go and they sometimes run in a different order as required.