Bluebulb Projects' The Measure of Things presents:
7,300 is about 55 times the number of Union Stations in the United States
In other words, it's 54.10 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.0185 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)