With more than 5000 employees, Hamburger Hochbahn AG is Germany's second-largest public transport company. In addition, there are 925 kilometres of bus routes with a fleet of 820 city buses. Hamburg's metropolitan railways are justifiably proud of their share of cost recovery of over 91 percent. This is a peak value in comparison with other public transport companies - especially as the fares are set by the city. "We face the challenge of maintaining our leading position in cost recovery while at the same time maintaining our infrastructure, some of which is already 100 years old", says IT coordinator Andreas Trost. CIM Database as a platform for uniform data management is the IT basis of this efficiency performance.