https://relatedwords.io/transports?starting_with=r

Railway, road, rail, river,.radiostation

I like river because if you think of water flow (water is your message), if one river is full or blocked the water will pass thru other river.

Notes and other stuff transmitted thru rivers.

Notes and other stuff transmitted thru Radiostations (or radio channels)

In this radio analogy,. someone chooses to voice his thighs over many radio channels (like 90Mhz,.102 MHz) and people can listen to all those stations.

If one station fails, the other still works