Strengthening of arched bridges with UHPFRC – Development of a pilot project for Deutsche Bahn. The most common deficiency of an arched bridge is inadequate maintenance combined with a missing or only partially intact waterproofing system. In the case of the railway overpass between Tiergarten and Mittellandkanal in Hanover, an additional issue is the insufficient covering height at the vault apex. This can only be compensated by weakening the vault's geometry or raising the track gradient. The solution is the use of cementitious ultra-high-performance fiber-reinforced concrete (UHPFRC). Due to the high packing density of this fiber-reinforced composite material, it is liquid-tight and simultaneously serves as a load-bearing and waterproofing element. Cementitious UHPFRC has excellent durability, rapid hardening times, and can be applied in thin layers due to its high load-bearing capacity. At the railway overpass between Tiergarten and Mittellandkanal, Deutsche Bahn is planning for the first time, to upgrade an arched bridge using UHPFRC prefabricated elements for the cantilevered edge beams and renew the waterproofing with a 3 cm thick layer of in-situ cementitious UHPFRC. The partial refurbishment will be carried out within a 56-hour track closure. This paper presents the structure itself, the trial tests conducted as part of the approval process and the technical solution developed for the project.