Dreaming of a railing means a chance to get an object or achieve a hit.
Dream dictionary: railing dream meanings
…Dreaming of seeing railings, denotes that some person is trying to obstruct your pathway in love or business. Dreaming of holding on to a railing, foretells that some desperate chance will be taken by you to obtain some object upon which you have set your heart. It may be of love, or of a more material form….
If you see the railing, then it shows someone in your waking life that is going on the right track to their succession. If you see yourself to be holding on some rail, then it shows that you are looking for something stable and safe in your waking life. You do not feel fully grounded. The dream suggests to be as much careful as you can.
If it is in good condition, the dream is a sign of good luck and protection. If it is out of place, it portends easy loves with no future. If broken, dashed hopes and disappointments.