Sent my way by Andy Woodruff, this map is all kinds of wrong. As it’s from around 2008, it shows an older configuration of the Silver Line routes, with an SL3 route going to City Point. However, the underlying base map hasn’t been adjusted to accommodate the diagram, so SL2 and SL3 appear to take you to destinations deep in the outer reaches of Boston Harbor, while Kendall/MIT is located in the middle of the Charles River. Climate change, perhaps?
The numbered legends for difficult-to-label Green and Silver Line stations is one solution, I guess… but it sure as heck ain’t pretty!