 Complete the following phrase:  The bobsleigh track was built for the 1952 Winter Olympics, where it hosted two bobsleigh events. Contrary to popular belief, this was not built at Korketrekkeren but as a separate run nearby also starting at Frognerseteren. It was built as a temporary, artificial track with the curves being constructed in snow and then frozen hard to ice. Trial runs were undertaken in 1951 and the bobsleigh course was not used after 1952. Both Olympic events were won by Germany, with Andreas Ostler and Lorenz Nieberl participating in both winning teams. The tobogganing hill hosted the inaugural 