Pub. Util. Code, § 185505

(a) The authority and any utility required to remove a utility facility or to relocate any utility facility may, by agreement, provide for the respective amounts of the cost to be borne by each. The authority may, without prejudice to its rights under Section 185506, advance the cost of removal or relocation, and, if the authority advances that cost, it is the duty of the utility to move its facilities as soon as reasonably possible so as not to delay high-speed rail construction. In the case of any utility that is not financially able to bear the costs of removal or relocation, the authority may by agreement provide for the work to be done on condition that the utility’s portion of the costs be repaid to the authority over a period of time not exceeding 10 years.

(b) Either party may maintain an action in a court of competent jurisdiction for an adjudication as to the obligations and costs to be borne by each party under any contract entered into by the parties at any time within four years after the cause of action first arose. The cause of action shall be deemed to arise at the time of the completion by the utility of the removal or relocation in question, or at the time of a breach of the agreement by either party, whichever occurs first. The filing of a claim with a state agency shall not be deemed a condition precedent to the maintenance by the utility of an action under this subdivision.