![PDF] How to Expand Subway and Urban Railway Networks: Light Rail Extensions in Madrid, Spain | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/30767603bdb90b4457b81d208727d7157907b1dc/17-Figure1-1.png "PDF] How to Expand Subway and Urban Railway Networks: Light Rail Extensions in Madrid, Spain | Semantic Scholar")
PDF] How to Expand Subway and Urban Railway Networks: Light Rail Extensions in Madrid, Spain | Semantic Scholar
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