First, We offer you to choose a border for your pass
Mehran/Zarbatiyeh border and Khosravi/Mundhiriyeh border are the closest Iranian borders to Karbala and Najaf, and a large number of Moukebs serve pilgrims on this route.
Mehran border: The closest to Karbala and Najaf and has the most facilities and services
Khosravi border: The closest and fastest for travel between Mashhad and Karbala directly