This Policy Focus Report was a product of the Lincoln Institute of Land Policy, the Regional Plan Association and their joint venture America 2050. The Lincoln Institute of Land Policy has been engaged in a series of projects with the Regional Plan Association for more than a decade. The partnership spawned the national initiative known as America 2050, which is aimed at meeting the infrastructure, economic development and environmental challenges of the nation, in preparation for a population increase of about 130 million by 2050. A major focus of America 2050 is the emergence of megaregions - large networks of metropolitan areas, where most of the population growth by mid-century will take place. Examples of megaregions are the Northeast Megaregion, from Boston to Washington, or Southern California, from Los Angeles to Tijuana, Mexico. High-speed rail is capable of linking employment centers and population hubs in corridors up to 600 miles in length in 11 U.S. megaregions.This Policy Focus Report was a product of the Lincoln Institute of Land Policy, the Regional Plan Association and their joint venture America 2050. The Lincoln Institute of Land Policy has been engaged in a series of projects with the Regional Plan Association for more than a decade. The partnership spawned the national initiative known as America 2050, which is aimed at meeting the infrastructure, economic development and environmental challenges of the nation, in preparation for a population increase of about 130 million by 2050. A major focus of America 2050 is the emergence of megaregions - large networks of metropolitan areas, where most of the population growth by mid-century will take place. Examples of megaregions are the Northeast Megaregion, from Boston to Washington, or Southern California, from Los Angeles to Tijuana, Mexico. High-speed rail is capable of linking employment centers and population hubs in corridors up to 600 miles in length in 11 U.S. megaregions.