The railways of Viet Nam would also make an interesting subject. The either currently use, or in the recent past used, diesel locomotives built by manufacturers in Viet Nam, USSR, Australia, USA, China, Romania, Czechoslovakia, India, Belgium and Germany. Steam locomotives, longer in use on the state system (DSVN), were built in France and have a distinctly French appearance. Steam locos were numbered using the French system - e.g. a 2-8-0 was classified as a 140, while a 4-6-2 would have been a 231 class. I’m not sure where the coaching and freight stock in use was built, but a lot of it has a Chinese look about it.
One aspect of the main line from Ha Noi to Ho Chi Minh City (Sai Gon) - generally referred to as HCMC - which would be of interest to modellers is the track layout at Nha Trang, a beach resort city about 400 km north of HCMC. The station here is in the city centre, about 1.5 - 2 km east of the alignment of the main line. Approaching from either direction (i.e. southwards from Ha Noi or northwards from HCMC) the two tracks run parallel without a physical connection eastwards to the station, in a layout reminiscent to the former set up between Lavistown and Kilkenny. Approaching the station there is a scissors crossover, after which a busy road is crossed on a level crossing and shortly later trains enter the station itself. Between the level crossing and the platforms in the station, another running line can be seen diverging to the right-hand side. This is the end of a tight loop which takes the main line between the backs of houses and industrial units and allows trains continue on their way without having to run around in what would otherwise be a dead-end station. In the centre of the loop there are freight sidings and engineering workshops.
It would seem that all passenger trains (possibly except the couple which terminate here) use the loop in a clockwise direction. I can’t say if freight trains use the loop as they might run around or change locos here during the time they are serving the yard. Unfortunately, when planning a recent trip to Viet Nam I didn’t know of the interesting layout in Nha Trang so didn’t put in a stop there.