The Rome–Civita Castellana–Viterbo railway is a regional railway line in Italy that connects the city of Rome to the towns of Civita Castellana and Viterbo. It is operated by Trenitalia and serves as an important transportation link for commuters and tourists traveling to these areas. The railway line spans approximately 100 kilometers and features several stops along the way, providing access to various local attractions. It plays a significant role in promoting tourism in the region, particularly for visitors interested in exploring the historical sites of Viterbo and the surrounding countryside.