49 U.S.C. § 22904

Notwithstanding the requirements of section 22902 of this chapter, the Secretary of Transportation may approve the use of a capital assistance grant under this chapter to fund self-insured retention of risk for the first tier of liability insurance coverage for rail passenger service associated with the grant, but the coverage may not exceed $20,000,000 per occurrence or $20,000,000 in aggregate per year.