You can load ~200 metro maps of pMetro project http://pmetro.su/Maps.html
Build shortest route and calculate trip time using subway and other city transports.
There is additional information for stations and 2D schemas (double tap for show).
Author: Gennady A. Zavodovskiy
Market link: com.utyf.pmetro
Web site: http://github.com/Utyff/pMetro/wiki
Market downloads: 10,000-50,000
Market rating: 4.2 / 5.0