Sentimental Journey on a Long-Distance Amtrak Route Threatened With Cancellation By LAURENCE ARNOLD Associated Press Writer ABOARD THE CALIFORNIA ZEPHYR (AP) — It creeps through the twilight into Ottumwa, Iowa, a silver ghost from the past. In 1923, 57 passenger trains a day called here. Today there is only the California Zephyr — eastbound in the morning, westbound at night. Ottumwa's two-story brick depot has been in continuous use since 1889, but only barely. Amtrak rents a glass office for its one attendant. Most of the building is used by the local historical society, as a museum. The Zephyr...