The challenge facing the signal industry was achieving the same level of safety and reliability that was inherent to purely mechanical systems. An experimental hydro-pneumatic interlocking was installed at the Bound Brook, New Jersey junction of the Philadelphia and Reading Railroad and the Lehigh Valley Railroad in 1884.
This is an example of an expository paragraph   In 1997, 175,000 volunteers picked up three million pounds of garbage along the coasts of the United States. As a result, bo â¦ th people and sea animals can enjoy cleaner and safer environments.
The characteristics which make these essays... expository are that they both use evidence, examples, or facts to explain a concept or facts to inform the reader. The information is presented fairly and in an unbiased manner. âA Soul as Free as the Airâ tells the reader about the main points in the life of Lucy Stone.