The development of the transcontinental railroad system allowed people to travel great distances more quickly. how did the "bulking up" of railroad technology, including the use of steel rails and larger trains, affect what people could move?

The things that could be moved were the passengers and heavy things which included iron and other heavy things.

Explanation:

When The railroad system got developed, it made a huge remark on the people and was a very helpful innovation. It was used to carry people from one place to the other place.

Not only passengers, the railroad system was also used to carry heavy things like iron, wood and so on from one place to the other, helping to develop trade and production activities. With time passing on, it got even more developed leading to the development of locomotives and iron rails.

the words “strangest” and “unusual” suggest that the narrator is about to tell the story of an odd or puzzling group of people.