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| By 1955 the annual cost of
running the "Gummibahn" was DM180,000. Railway engineers calculated that if they built a huge dam of earth across the entire width of the valley then this would only cost DM2.30 compared to DM8.50 for a new viaduct. |
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| This proposal was extremely unpopular even when it was modified to cover only the gap between the remaining arches. | |
| Finally, in 1960, after two years of acrimonious debate the Bundesbahn (German Railways) dropped their plan for the building of the earth dam. |