The Zaynab shrine has served as a center of pro-Iranian activity since the Syrian civil war began in 2011, and as such has been targeted by other groups.
Bahrain, home to the US Navy Fifth Fleet, has long blamed Tehran for stirring up its own majority Shi'ite Muslim population against the country's Sunni monarchy.
His return likely planned for the 2025 parliamentary election, could threaten the growing clout of rivals, including Iraqi Shi'ite parties and armed factions close to Iran.
"We should see the trains moving in about 18 months because it's a small distance," Nasser Al-Asadi, transport advisor to the Iraqi prime minister, told Reuters.
Terrorist leader Hassan Nasrallah threatens Israel, European countries and puts out homophobic statements as his militia terrorizes Lebanon.
Saudi leaders no doubt believe that restoring diplomatic relations is a useful political ploy, but surely appreciate that the deal is superficial.
Iran and Saudi Arabia agreed to revive relations earlier this month after years of hostility that had threatened stability and security in the Gulf.
The two men sentenced to death said during the trial that they had been in contact with the Islamic State in neighboring Afghanistan and helped organize the attack.
Iran, discontent with their current regime of torture, is attempting to expand their influence in Israel.