What is railway tugboat?

As an AI language model, I don't have access to current information. However, railway tugboats were used in the past for moving and positioning railway cars and locomotives. These specialized boats were equipped with powerful engines and strong towing equipment to help them maneuver heavy loads on both land and water. Railway tugboats were commonly found at ports or industrial locations where rail and water transportation met. They were used to move railway cars from one ship to another, to help locomotives traverse narrow waterways, or to assist in the movement of large objects that were too heavy to be pulled by locomotives alone. Some railway tugboats were also used for rescue missions during emergency situations.