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Commuter rail systems form the backbone of many metropolitan transport networks, moving large numbers of passengers between suburbs and city centers during peak hours. Compared to private vehicles, trains carry far more people per unit of energy consumed, which reduces per-capita emissions and eases road congestion. However, ridership tends to be highly uneven, surging during morning and evening rush hours while remaining sparse throughout the middle of the day, a pattern that complicates scheduling and cost recovery. Aging infrastructure poses another challenge, as many systems still rely on tracks and signaling equipment installed decades ago, requiring costly upgrades to maintain reliability. Advocates argue that consistent public investment, rather than relying solely on fare revenue, is essential for commuter rail to remain a viable alternative to car dependency.