I wonder how long it would take if the Feather River detour were used. One point to consider is this: suppose Amtrak were given slots on the Feather River route. If it took too long, it might require a seventh or eighth trainset... which Amtrak is unlikely to be able to scrape up, although it did scrape up a sixth set for the Empire Builder not so long ago. At some point detouring becomes more work than it's worth. One of the reasons that bustitutions did not happen in the "good old days" was that there were *always* detour routes, and they were usually maintained to the same speeds as the mainline, and they were never *all* overcrowded. If they were all crowded, some entrepeneur would build yet another railroad! And of course, equipment shortages were unheard of. The removal of redundancy has made it much harder to avoid busing.