How did washington become part of the transcontinental system?

In 1901 two railroad companies agreed to build a new station together in Washington. The project had many setbacks but some years later the first train to arrive with passengers was the Pittsburgh Express on October 27, 1907. The transcontinental system is a railway system that unites the east and west coast of the USA.

b. 155 enlisted men and no officers

the tallest building in the western hemisphere and the sixth tallest building in the world