Back in the early 90's I worked on the Great Man Made River Project in Libya. After one leave period I was asked to take some tender documents from my then employer for a planned railway along the full coastline with a branch to Sabha in the south. We didn't win the tender but somebody started construction. If you look on Google Earth near the town of Al Khums you can see a new railway leading from a new port to some sort of production facility. Although some waggons can be seen it looks pretty abandoned, probably as a result of the civil war.
The railway curves back from Alkhoms port (co-ordinates 32.675819, 14.250684) to what looks like a railway construction depot (32.621133, 14.262448). There appear to be carriages / multiple units / tram vehicles in the port sidings on Google Aerial. Anyone like to take a guess what they are? There is another unit/pair just outside the port here (32.670037, 14.245584).
The part constructed lines head east and west from the depot roughly following the coast road. Westwards it heads to just short of the Tunisian border (33.131620, 11.594136). Eastwards to just past Buerat (31.277418, 15.991910). Open Railway Map shows the proposed route, Google Aerial fades in and out according to the amount of construction work carried out and, lets face it, your enthusiasm for interpreting lines in the sand!
Another line heads west then south from the depot to a 'manufacturing facility' (32.630669, 13.626607). This line runs north of the East-West coastal line then turns south to cross it.
The gifted train set and completed length of track is here (32.828764, 13.111515). Click on the google map pointer for a picture of the vandalised unit.
From the Jim Fergusson data sheets and a bit of extra measuring I get a former 950mm gauge network of 421km plus the Western Desert Railway (WWII) approx 188km of standard gauge from the triangular junction just inside the Egyptian border (31.522365, 25.059536). Wkipedia gives a distance of 125km which is about right to reach Tobruk. Open Railway Map has the line heading farther west to Ayn al Ulaymah (32.142669, 23.356480).
Just stick those strings of numbers into your mapping service search bar to go straight to the locations.