Q QAP - Quanah, Acme and Pacific Railway QC - Quebec Central Railway QCCX - Quantum Chemical Corporation QGRY - Quebec Gatineau Railway/Chemins de fer Québec-Gatineau QOCX - GE Rail Services QOHX - Quaker Oats Company QOTX - Quaker Oats Company (Chemicals Division) QRR - Quincy Railroad QSMX - Quaker State Oil Refining Corporation QTTX - TTX Corporation
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