The Superliners established a standard basic design for bilevel railcars, including the upper-floor height of above the top of rail. Built primarily for long-distance services, the Superliners were not ideal for use on corridor routes. They were not equipped for the volumes of passenger loading and unloading found on corridor routes, nor did they have amenities designed for these shorter trips. The 1990 passage of California propositions 108, 111 and 116 authorized the sale of nearly $3 billion in bonds for the creation of rail services across the state. Proposition 116 required the California Department of Transportation (Caltrans) to create specifications for standardized railcars and locomotives that would be suitable for rail operations across the state.