Via the now inactive nyplmaps Tumblr:

Map showing surface car lines of Manhattan Island, August 13, 1915.

This 61 x 185 cm color map with an approximate scale of 1:12,500 shows the streetcar lines operated by NY Railways, the Third Avenue System and the Second Avenue Railroad Co. that once roamed the Isle of Manhattan. 

I’ll reblog just about anything transit-related from the New York Public Library’s map collection, but this is even more special than usual. What a beautiful map!