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I have a dataset of pairs of parallel linear features (railway tracks) and I need to simplify each pair into its central/median line. This could be achieved by computing a skeleton as suggested in this question but I am looking for a simpler solution: a line being the "average" of the two input lines would be a fair approximation. For example:

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Would such transformation be implemented in any mainstream GIS software or library?

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There is an ArcGIS tool called Collapse Dual Lines to Center line that will accomplish this task. The tool requires and Advanced ArcGIS license. Here is a link to the tools help for 10.x

GRASS also has a tool called v.Centerline that will work in both GRASS or via the GRASS tools in QGIS. Here is a link to the GRASS tool.

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