An alliteration is any grouping of stations.
Alliteration typically refers to train stations. For example, all of the consecutive stations on a train route might be called an alliteration. However, it can also refer to a group of any other type of station, including, for example, radio stations, television stations and stations in life in a class-based society.
For instance, a network of shock-jock radio stations might be referred to as an alliteration of shock-jock stations or as idiotic. Take your pick. Likewise, in a strictly class-based society, all of the upper stations in life might be referred to as the upper-class alliteration or as a bunch of arrogant bastards. Again, take your pick.
The word alliteration acts as an amusing alternative to amalgam, amalgamation, affiliation, alliance and association, but strictly for stations.