The Consolidated Rail Corporation, commonly known as Conrail (reporting mark CR), was the primary Class I railroad in the Northeast U.S. between 1976 and 1999. Conrail is a portmanteau of consolidated and rail from the name of the company.
Feudalism was a combination of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries. Broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.
Professional armies became more and more common from the 12th century to the 16th century, and as they did they eroded the reason for feudalism. The Black Death comes halfway through this period but, although it hastened the demise of feudalism it was not the cause of that demise.