Theoretically speaking, if I was an entrepreneuring billionaire and I wanted to bring back one of the great American passenger trains (Super Chief, California Zephyr, Panama Limited, Empire Builder, City of Los Angeles/San Francisco, 20th Century Limited, Broadway Limited, Powhatan Arrow, Coast Daylight, etc.) to run on a regular basis (let's put it at at least two times a month for a start), which option would be more feasible from an economic/technical/legal perspective?

1. Acquire all of the surviving rolling stock (sleepers, dining cars, dome/observation cars, baggage cars, etc.) from the original consist from private owners, heritage railways, and museums, as well as matching surviving locomotives (can be from ones different railroads since thousands of functionally and aesthetically identical EMD F and E units were sold to all Class I railroads). Renovate them as necessary to make them FRA-compliant, obtain waivers wherever possible. Put them into service as a part-luxury train, part-mobile museum.

2. Commission the construction of a replica consist. Building entirely new streamlined cars from scratch, designed to match the internal and external appearance of its original as much as possible, with changes only being made when it's literally required to make the car FRA-compliant/modern user friendly (updated wiring, HEP, power outlets at seats, WiFi support, replacing wooden paneling with MDF paneling etc.). Motive power consists of custom-built Siemens Chargers designed to resemble the original E and F units (streamlining, bulldog noses, matching paint schemes, etc.) as much as legally possible.

1/2