However, they could be linked through a metaphorical or abstract concept:
* "Top mood" could be interpreted as a state of feeling extremely good, like being on "top of the world."
* "Rail" can be associated with a sense of movement or progression, like riding a train on a track.
Therefore, the connection could be that all three words represent a sense of upward movement, elevation, or progression.
It's important to note that this connection is entirely based on interpretation and might not be universally agreed upon.