Société royale grand-ducale des chemins de fer Guillaume-Luxembourg
The Société royale grand-ducale des chemins de fer Guillaume-Luxembourg or "Royal Grand Ducal William-Luxembourg Railway Company" (also Compagnie Guillaume-Luxembourg or just Guillaume-Luxembourg or GL), was a Luxembourgish company, with French capital, created in 1857 to operate the 1855 concessions for the railway lines in the Grand-Duchy of Luxembourg. It constructed a set of lines that made up the railway network called the Guillaume-Luxembourg network.