A. Because they were driven by steam power.
B. Because they did the work animals used to do.
C. Because they pulled cars full of coal.
D. Because they were made of iron.
A. He wanted the railroad to be developed.
B. He wanted to have a more powerful steam engine.
C. He wanted to own the land near the railroad.
D. He wanted to build his own railroads.
A. The train could not run as fast as the horse.
B. The engine failed to build up steam.
C. The engine broke down and the train stopped.
D. The engine broke into several parts.