In Afghanistan there are several 2 ft gauge railways…

A very interesting claim that there were some 2 foot gauge railways in Afghanistan in 1894 (one may have been at the Mashin Khana royal arsenal in Kabul).

Narrow-gauge railways.
Wednesday, 25th July, 1894.
J Harris in the Chair:
This 2-ft. line is also established in Madagascar where the French rule, it is also in Afghanistan, Turkestan, and Siberia. It was introduced there by Skobeloff. When he was meditating the invasion of India he had this introduced, and I may state that the Russian troops were seen using one of those railways on the frontier for military purposes before the British knew anything about it. When the outposts observed it they reported it to the Commander-in-Chief and he telegraphed to the War Office. The War Office ordered railways of this sort to be sent out straight. They were sent over mountains on the backs of elephants to the frontier. In Afghanistan there are several 2-ft. railways.
Source: Narrow-gauge railways, Minutes of Evidence at the railway standing committee, Victoria, Australia.

Narrow gauge railways in Tajikistan

Narrow gauge railway Dushanbe – Kurgan-Tube – Kulyab, Nizhniy Panj” – in Russian, but Google Translate works pretty well.

The 750 mm gauge railway network in the southwest of Tajikistan was started in 1929. Originally there were two unrelated lines: Kurgan-Tube – Nizhniy Panj…

Nizhniy Panj is on north side of the river which forms the border with Afghanistan. The railway closed in the 1990s, but there is some talk of building a new line in the area with a bridge to Afghanistan and onward connections to Kunduz, Mazar-i-Sharif and beyond.

There is also a link to a general history of railways in Tajikistan (in Russian).