Here’s the MBTA’s map of the T, georectified on the individual stations. If you want to overlay it onto a real map of Boston to get a sense of how that it maps onto the physical geography, you can explore it in QGIS.
But to share, you might want to put it on the web. Here’s a link to georectified version of the MBTA T map that you can pan around. When you installed QGIS, you got enough software to build something like this yourself; but if you want to see your file online, you can also just send me the .tif and .vrt files you get by exporting a map in QGIS and I’ll put it online. Instructions on just what you need to do are in the first paragraph here.