Bluebulb Projects' The Measure of Things presents:
25 is about one-fifth the number of Union Stations in the United States
In other words, it's 0.1850 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 5.410 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)