The opening of Veresk Bridge on Ordibehesht 16, 1314 Jalali, stands as a significant event in Iran’s modern engineering and transportation history. Located on the Trans-Iranian Railway in the Savadkuh region of Mazandaran, the bridge was inaugurated in 1935 and quickly became an engineering marvel of its time, measuring 86 meters in length and 110 meters in height from the valley floor. Constructed under the order of the Iranian government with the collaboration of the Danish company Kampsax and European engineers, its main purpose was to complete the north-south railway and facilitate the movement of goods and passengers across the country. During its construction, more than 70 workers and engineers lost their lives, highlighting the immense challenges and dangers involved. Due to its strategic location, Veresk Bridge played a vital role during World War II as a key route for the transport of troops and equipment. In the official Iranian calendar, Ordibehesht 16, 1314 is designated as the date of the Veresk Bridge opening to commemorate its historical and engineering significance. This date was officially added to the Jalali calendar to recognize the bridge’s pivotal role in Iran’s infrastructure development.