CHICAGO — The Chicago Transit Authority's sales tax rating took a hit from Moody's Investors Service, triggered by escalating capital needs and what analysts believe is an unfavorable political landscape to raise revenues for the system as the city and state grapple with pension woes.

Moody's lowered the CTA's $2.9 billion of sales tax revenue bonds one notch late Friday, to A1 from Aa3, and assigned a negative outlook, while lowering its rating on $77 million of lease debt sold through the Chicago Public Building Commission to A2 from A1.

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