The Opossum Run Branch was a former railroad line constructed by the Pennsylvania Railroad in 1884. It ran from New Haven to West Leisenring, Pennsylvania, through the mining towns of Trotter, Leisenring, and Monarch. The line was abandoned in the early-to-mid 1900s. Remnants can still be found to this day, most notably in West Leisenring, where a few railroad bridges and a row of coke ovens still remain.

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