+ Currently Transit Info for About 450 Cities Worldwide.
Exactly what info is available varies from city to city and remember that Google Transit might have info for one or more transportation systems in a city/region. But that does not mean (at least for now) they have info on every transit system for that area. They're constantly adding new data and transit systems so check back often. ResourceShelf will also do its best to keep you posted.
+ Since the Beginning of 2010, More Info Added to Transit Layer and Base Maps.
Before, the transit map was placed on top of the base road map, obscuring some important information in the base map and competing visually with the complexity of the road network. With this redesign, we're changing the entire base map to put more focus on the transit lines, and lower the prominence of roads.
To try this out for yourself, select "Transit" from the "More" drop-down on Google Maps in any city where transit maps are supported, or simply click on a transit station on the map itself.
See Also: Here's a transit map where just a small portion of Manhattan (NY, NY) is visible. Several subway lines are seen (note the colored lines) every couple of blocks. The "M's" seen on the map (they're also clickable and provide a lot of related info) denote subway stops. The numbers or letters next to an "M" identify the subway station name along with what train line(s) stop at that station. For example, subway lines 1, 2, and 3 stop at 42st/Times Sq.
See Also: For More Info Along with Before and After Maps to Easily Compare What the Maps Used to Look Like vs. What They Look Like Today, See this Google LatLong Blog Post.
Toggle off "Transit" (It's Under the "More" Button) and you'll see the colored lines disappear and the roadways regain prominence. However, the "M's" remain visible and clickable.
For Directs Comparisons Between the "Old Look" with the "New Look" this Lat Long Blog Post Provides A Couple of Additional Examples.
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