Very simple, the picture is of the 4 approach tracks Newcastle Central from the north and east. The two to the left will bear to the left through Manors and up through Jesmond, West Jesmond, South Gosforth, Longbenton, and Benton towards the coast clockwise. Depending on the date trains would run that way every 15/20/30 minutes. The two tracks to the right will be the way that train will return after completing the loop, the train normally then being on the far right hand track, same timings.
The Southern style rolling stock only operated the South Tyneside line to South Shields. After pulling out of Central they'd have curved south across the famous diamond crossing below the castle before the High Level Bridge into Gateshead.
The Southern units did take the track pictured once a day en route to the car sheds at South Gosforth. They were distinctly different with their multiple doors down the side of each carriage rather than the sliding doors at the ends of the former LNER stock. (All the first generation DMUs were serviced at South Gosforth too.)
I only walked alongside the tracks near West Jesmond 4 times a day for 5 or 6 years on my way to school (school dinners weren't available because I lived too close), so knew all those trains very well. Here's one I captured one evening in 1965 at Ilford Road Metro station, or so it would become! I was more interested in the firemen than the train at the time. In those days lineside fires were quite common after freight trains for the collieries had passed. Electric trains were routine, 10 a penny.
Don't take my word for it. See here;
https://www.lner.info/locos/Electric/lner_tyneside.php I'd forgotten that these twin car units ran on an articulated chassis with 3 bogies.
https://www.lner.info/locos/Electric/lner_tyneside.php