The Boy Inventors' Diving Torpedo Boat (Esprios Classics)

"The car was on a steep down grade. Its speed was momentarily increasing, and it leaped and swayed wildly as it dashed down the hill. The motorman had hardly spoken before he made a leap from the front platform. The two boys saw his form sprawling on the road as he landed staggeringly. He was followed by the conductor of the car, who, more fortunate, managed to keep his feet after his jump.
All this happened with the rapidity of a swiftly moving motion picture film. The two boys found themselves alone."