Problem: Does "By 1878, because of the growing popularity of the city, one railroad line could no longer keep up with demand." answer the question "By what year was demand so great that one railroad line could no longer keep up with the demand?"

A: yes

Problem: Does "In this way, the ground (or any large conductive surface) plays the role of the second conductor of a dipole, thereby forming a complete circuit." answer the question "What is used to close the circuit of a dipole antenna?"

A: yes

Problem: Does "In the past the Olympics have allowed a restricted number of over-age players per team." answer the question "What year were professional players allowed to play in the Summer Olympics?"

A:
no