Looking for underground stations

[newguy]

I R visiting the UK next month and was wondering if there is some way to download the underground stations as POI or Waypoints?? Tried to google, but did not find anything. (obviously I wont try and use the gps underground, but useful for walking to the closest station when outside)
Any ideas?

 

[Hermanator]

 

[LuckyStriker]

 

[williaby]