It began to lose money in the mid 20th century, and in 1968 it merged with its competitor, the New York Central, to form the Penn Central Transportation co.

This paper describes the technical methods to apply the technology of railway computer interlocking software test into the central transportation control system of Metro.

The harsh weather destroyed crops, wrecked power lines and cut off transportation for a wide region in central and southern parts of the country, where the winter weather is usually temperate.