There's a few stations served by the Tyne and Wear Metro between Pelaw and Sunderland where you can see the train arriving at, or just after it leaves, the previous station:
At Brockley Whins, if you have good enough eyesight you can see the Sunderland bound Metrocars not long after they have joined the National Rail system at Pelaw, before they even reach Fellgate. It's most apparent after dark, when the headlights are easily visible for a great distance.
At East Boldon, you can see southbound Metrocars not long after they have left the previous station, Brockley Whins, which can be disconcerting to the unitiated as there are still cars crossing the level crossings ahead of the train! You can also see northbound trains not long after they leave Seaburn station.
And at Seaburn station, you can see northbound trains approaching not long after they have departed Stadium of Light station: For southbound trains, what is more interesting is that you can watch almost the entire sequence of four-aspect signalling with the train still in view as it moves through each section: I presume that this is also the case when standing at East Boldon, Brockley Whins or Fellgate stations, but I have spent much more time at Seaburn station over the years.
It is worth noting as well that the stations on the Sunderland extension of the Tyne and Wear Metro are spaced much further apart than those on the original Tyneside system: Of those stations mentioned, only Stadium of Light and Fellgate have been added since pre-Metro days, and Brockley Whins - Pelaw (Even before the heavy rail trains made their next stop at Heworth) was always a notably long section.