Train trip from Philadelphia to San Francisco in 1923

From: "Madge Walls" majwalls@comcast.net

I’m writing a novel that involves a train trip from Philadelphia to San Francisco in 1923.

I’m wondering if a person would get aboard in Philadelphia or need to take a commuter run to New York City to commence the cross country journey?

If departing from Philadelphia, what station would they have departed from back then? ...

—Madge Walls, Novelist from Hawaii, currently in Oregon