A procedure to systematically find actions to improve punctuality concerning railway infrastructure, and giving the greatest improvement is illustrated. The transports of a company producing steel slabs in one factory and performing rolling in another are investigated. Reliable transports between plants are crucial to market competitiveness. The transport chain of steel slabs is described and the distance by train is investigated regarding punctuality, transportation times and causes for lack of punctuality. Pros and cons of the procedure employed and ways to improve punctuality are discussed, including infrastructure maintenance.