Two huge construction firms that are helping to build about 54 miles of bullet train structures in California’s Central Valley are seeking an additional $300 million on their fixed-price contracts, the Los Angeles Times has learned.

The increases, if the state ultimately agrees to cover them, would further bloat the bill for what has been touted as the easiest and most predictable section of the Los Angeles-to-San Francisco system.

The potential increases lend credence to the findings of a December risk assessment by the Federal Railroad Administration that costs for building the full 118 miles of work in the Central Valley could jump by 50%, or $3.6 billion, above current estimates.

The increases are described in letters from Tutor Perini Corp. and Dragados USA. The firms make the case that their contracts do not cover the full scope of the work and that the state’s management of the project is causing delays.

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