Railway Gazette International on the latest Afghan rail plans:

Afghan rail strategy takes shape

[…]
The first phase would start at Sher Khan Bandar on the Tajik border, connect at Naibabad with the 1520 mm gauge line now under construction from Uzbekistan, and continue through Mazar-i-Sharif to Herat, with the possibility of a link to the Turkmemistan Railways line at Towraghondi. A branch would run from Shirbirghan via Andkhvoy to the Aqina border crossing with Turkmenistan.
[…]
A second phase would see a Chinese-backed line built from Mazar-i-Sharif to Kabul, Jalalabad and Torkham, near the Khyber Pass. The long-proposed extension of Pakistan Railways’ Chaman line to Kandahar is also planned.
Source: Railway Gazette International, 2010-06-28