 In 1970, Western Pacific, claiming multimillion-dollar losses, dropped out.However, the D&RGW refused to join the national Amtrak system, and continued to operate its share of the Zephyr equipment as the "Rio Grande Zephyr" between Denver and Salt Lake City.By 1983, however, citing continued losses in revenue, the D&RGW decided to get out of the passenger business altogether and join Amtrak.