The number of tickets sold for Tehran Museum rose by 1.5 times comparing to similar period last year, he said.
Manager of an American tourism company who has already arrived in Iran by Golden Eagle Danube Express said a group of tourists from the US would visit Iran in 2015.
He has already brought members of Metropolitan Museum of Art to Iran.
"I came by the train to try this kind of trip. Because Americans plan to visit Iran by the train in the near future," he said.
"We have made planning for Americans' visit to Iran. Therefore, we need to investigate all conditions and make planning for the project to be carried out exactly and properly."
Tourists from Germany, Russia, Switzerland, Denmark, Britain, Australia, Spain, Singapore and Turkey have already arrived in Iran in two 78-member groups via the train.
They visited historical and religious sites of Tabriz, Zanjan, Yazd, Isfahan, Shiraz and Tehran and then flew back to Istanbul from Tehran.
With more than 5,500 years of civilization behind it, Iran has a rich and colorful culture.
The country’s architecture, painting, pottery, food, wildlife, beautifully diverse geography, and its welcoming people have always made Iran one of the most favorable tourist destinations in the world.
However, during the past two years, Iran has been receiving an increasing number of tourists from all over the world.