An Inkscape SVG bare template for making the maps with line routes for Kraków trams. Simply color the grey lines with blue or any other color along the path of the selected tram line, and write its number in the bottom right corner. Becasue rsvg has problems with handling non-transparent backgrounds, you must put a white rectangle in the background, convert the line number to shape and save the file in "Clear SVG" before uploading it to Wikimedia Commons.
Own work
Zyxist