Final answer:
The glory days of the railroad industry ended by the 1930s due to various factors including economic downturns and the Great Depression.
Step-by-step explanation:
The statement is true. The glory days of the railroad industry ended by the 1930s. The railroad industry experienced a decline starting in the late 19th century due to various factors, including economic downturns, the rise of alternative modes of transportation like automobiles and airplanes, and changes in government regulations. The Great Depression in the 1930s further impacted the industry, leading to bankruptcies and closures of many railroad companies.