At least three other bullet train bridges in the Central Valley used the same design as the Avenue 8 bridge and are now being redesigned, according to a January rail authority status update, raising questions about whether potentially more costly designs will be required in the future. The previous design for Avenue 8, using what is known as mechanically stabilized earth walls, is generally considered cheaper than the new design, using cast in place abutments.

Source: Los Angeles Times June 08, 2018 19:30 UTC