Final answer:
Amtrak started rebuilding the best of its 'Heritage' fleet in 1979, with the goal of preserving historic railcars and locomotives while enhancing the passenger experience.
Step-by-step explanation:
Amtrak began rebuilding the best of its 'Heritage' fleet in 1979. The company recognized the value of preserving and restoring historic railcars and locomotives, and initiated a program to refurbish and upgrade these vintage vehicles. By doing so, Amtrak aimed to offer passengers a unique travel experience while preserving the rich history of America's railways.