A map of US railroads and Amtrak stations. Data from the National Atlas. Based on Mike Bostock's Swiss Cantons example and the U.S. Atlas project.
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://d3js.org/topojson.v1.min.js to a secure url
https://d3js.org/d3.v3.min.js
https://d3js.org/topojson.v1.min.js