Neal Cassady traveled back and forth across the country, usually driving cars like Hudsons at high speed. he looked for jobs, fresh experiences, and new friends. Kerouac began to travel with him. They lived in and visited cities such as Denver, San Francisco, Monterey, and even Mexico City. They also looked sometimes for Cassady's father, who disappeared years earlier. Kerouac got sick in Mexico City, and Cassady left him behind at the hospital. Kerouac had to make his own way home. He took this very hard, and was angry with Cassady. He forgave him later, when they met again, and he made Cassady the central character of his new book. One job Kerouac could fall back on, thanks to Cassady, was as a railroad brakeman.