historical trolley and bus transit data in Hartford CT with modified version of leaflet-map-polygon-tabs
https://ontheline.github.io/otl-transit/index-frame.html
embed in On The Line book
<iframe src='https://ontheline.github.io/otl-transit/index.html' width=100% height=535></iframe>
Data compiled by Adam Polinski, “Transit Era Hartford: Using the Past to Plan the Future.” Master’s thesis, University of Connecticut-Storrs, 2015. http://digitalcommons.uconn.edu/gs_theses/856.