Tokyo Rail Map is an Android application that provides a comprehensive subway and train map for the Tokyo Metropolitan Area, including Yokohama and Chiba. Developed by Urban-Map VollmerSusdorf GbR, this free app offers users all the necessary information to navigate through the city's public transportation system.

With the latest version of this app, users can enjoy the following features:

• Pinch gesture to zoom in and out.
• Stations index with a search function to quickly find any station.
• Lines index with a search function and an overview showing the order of stations on each line.
• GPS support to show your approximate position on the map.
• Works in portrait and landscape mode.
• Map and all data are available in English and Japanese.
• Routing from any station to any other station with visualization on the map.
• Save your own favorite stations and routes for easy access.
• Upgrade to offline usage and remove ads.

Overall, Tokyo Rail Map is a great tool for visitors and locals alike to navigate the complex public transportation system in Tokyo. The app is easy to use, and the GPS support and routing features make it a breeze to find your way around the city. I highly recommend this app to anyone traveling to Tokyo or living in the area.