After gaining experience during the concreting of the first ring beam to strengthen the front foundation, the work to strengthen the rear foundation had to be repeated. First, the existing foundation had to be exposed. This is easier than in the front area, as it is not covered by the tracks that were temporarily laid after 1970. However, the rear wall of the locomotive shed is considerably longer, so that more extensive earthmoving measures are necessary. After a survey and structural evaluation of the existing structure, the necessary steps for retrofitting were determined. The top layer of clinker masonry, loosened by moisture and frost, was demolished, as were the first three rows of quarry sandstone masonry underneath.
After completion of the excavation and demolition work, the contour of the foundation is clearly visible (see second picture above). The layer now achieved is load-bearing and can serve as a basis for concreting a ring beam, analogous to the procedure in the front area.
Through careful and layer-by-layer demolition by hand, many of the original clinker bricks and also a large amount of quarry sandstone could be recovered. Some of these were stored for repair work on the existing locomotive shed (see third picture above).
