Line improvement

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As line improvement is defined as the selective or partially structural modification of roads , particularly of railway tracks , by improving the track alignment .

The main purpose of line improvements is usually to replace narrow track curves with ones with a large radius . A route can then be driven faster at the improved point than before. If the line speed in front of and behind the improved point was already high, the line improvement means that a longer section of the route around this point can be driven faster, since the time-consuming braking and re-accelerating are no longer necessary.

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A radical form of line improvement is the construction of a tunnel through an elevation that has previously been bypassed. One example of this is the Katzenberg tunnel .

In the case of lines that were once double-tracked and are now only single-tracked, it is sometimes possible to relocate the remaining track during renovation work so that the entire width of the subgrade is used for curved tracks . This improves the alignment, but makes it difficult to rebuild the second track.