Which of the following statements regarding trains is accurate?

The statement that trains often appear to be moving more slowly than they are is accurate because of a visual phenomenon known as the "motion illusion." When trains are viewed from a distance, especially if they are traveling in a straight line and through a largely featureless landscape, they can seem to move at a slower pace than their actual speed. This perception can be influenced by several factors, including the length of the train, the distance from the observer, and the speed of other moving objects nearby. People often underestimate a train's speed because it is a large, solid object that covers a significant distance while passing by, which can lead to the impression that it is moving more slowly.

The other statements do not accurately represent the characteristics of trains. For instance, while the speed of trains can vary significantly, they are capable of exceeding 30 mph, which makes that option incorrect. Additionally, trains often travel at higher speeds over long distances and can be faster than cars on highways, particularly when considering freight and passenger rail services.