This report (in Persian) appears to suggest that (tracklaying?) work is underway on the new railway from Iran to Herat, and it will open in the current (Iranian) year
The Fars News Agency reported on 27 May 2012 that Khaf-Herat Railway to Start Economic Revolution in Afghanistan. “[Iranian Consul-General Rahim Mohammad Yekta] stressed that the Khaf-Herat railway construction project will be implemented soon.”