I don’t know whether this counts, but Afghanistan is served by a few rail heads from Uzbekistan (Termez to Mazar-i-Sharif) and Turkmenistan (Thorgundi and Aquina). Those lines are all freight only. There is also a line from Iran supposedly in construction for at least 10 years.
And then there are two lines from the extreme east of Uzbekistan to Jalal-Abad and Osh in Kirghizistan. Also freight only, and I don't know to which extent it is still in use.
It's not connected to the main Kirghiz network, which is just one line from the Kazhak border to their capital city Bishkek, plus a couple of spurs.
I think that in eastern Mongolia, there is a north-south line, hanging from the Russian transsib, that serves a huge mining complex. Completely disconnected from the main network of Mongolia, and freight only.
And just for the fun, there used to be a similar situation, albeit on a much smaller scale, between Belgium and France. There was a line heading south from Signeulx, a tiny station on the southernmost part of the Athus-Meuse line. It went to Gorcy, an even tinier village in France, to serve a metallurgical industry that had no connection with the French network. Never had any passenger service, and administratively, it was a real nightmare. I think it closed in the 70ies.
And then there are two lines from the extreme east of Uzbekistan to Jalal-Abad and Osh in Kirghizistan. Also freight only, and I don't know to which extent it is still in use.
It's not connected to the main Kirghiz network, which is just one line from the Kazhak border to their capital city Bishkek, plus a couple of spurs.
I think that in eastern Mongolia, there is a north-south line, hanging from the Russian transsib, that serves a huge mining complex. Completely disconnected from the main network of Mongolia, and freight only.
And just for the fun, there used to be a similar situation, albeit on a much smaller scale, between Belgium and France. There was a line heading south from Signeulx, a tiny station on the southernmost part of the Athus-Meuse line. It went to Gorcy, an even tinier village in France, to serve a metallurgical industry that had no connection with the French network. Never had any passenger service, and administratively, it was a real nightmare. I think it closed in the 70ies.