A best interest plea means that  a defendant does not admit guilt to any offense, but agrees that a guilty plea is in his best interest under the circumstances. The defendant is sentenced, while still able to disagree with the prosecutor's description of events.
The transcontinental railroad began in Omaha, Nebraska and ended in Sacramento, California. Two companies built the railroad. The Union Pacific Railroad company began laying track from Omaha to the west while the Central Pacific Railroad company headed east from Sacramento. They both met at the middle in Promontory, Utah on May 10, 1869.
The coming of the Transcontinental Railroad, the first communication revolution in the USA. The First Transcontinental Railroad in the United States was built in the 1860s, linking the well developed railway network of the Eastern coast with rapidly growing California. The main line was officially completed on May 10, 1869.