TfL maintains a clear cyclists' tube map, but you won't see it at any stations - Image from TfL
{"Image Orientation": "Horizontal (normal)", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS5 Macintosh", "Image DateTime": "2014:01:17 23:20:49", "Image Artist": "Transport for London", "Image ExifOffset": "200", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "338", "Thumbnail JPEGInterchangeFormatLength": "5639", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1272", "EXIF ExifImageLength": "848"}