(a) A board may invest transit department funds in any obligation, security, or evidence of indebtedness in which the municipality for which the transit department was created may invest municipal funds.
(b) In making an investment of transit department funds, a board shall exercise the judgment and care, under the circumstances prevailing at the time of making the investment, that persons of ordinary prudence, discretion, and intelligence exercise in the management of their own affairs in making a permanent and nonspeculative disposition of their funds, considering the probable income from the disposition and the probable safety of their capital.