Not all observers agree that the Shah minimized foreign influence. One complaint about his development program was that the north-south railway line he had built was uneconomical, only serving the British, who had a military presence in the south of Iran and desired the ability to transfer their troops north to Russia, as part of their strategic defence plan. In contrast, the Shah's regime did not develop what critics believe was an economically justifiable east-west railway system. However nowadays, it is importance of north south transit corridor is considered as important and there is no justification about west-east transit.