How do you remember which rack you have left your bike in? I have more than once had to spend time looking for my bike at the station, what’s your method to remember the rack you put it in?

Do any town have a system of numbering or labelling the bike racks so it is easy to find your bike?
Use your phone to take a photo of your bike location, being sure to get some easy to find landmarks in the photo as well. E.g. if you had just taken the photo above and your bike is the front centre one, those two trees should be fairly easy to find again when you come back.

If it still takes a while to find (or the search area is very big) and your phone has GPS, you can probably tag the photo with the location as well.