during the war. The "Système Péchot" as it is named in French became the dominant system for trench railways with an estimated of track built by the 5th engineer regiment. 250 0-6-0T of Decauville's Progres design were built for military service. 32 0-6-0T of American design and 600 gasoline mechanical locomotives were purchased from Baldwin Locomotive Works. The Maginot Line employed a gauge supply system of petrol-powered armoured locomotives and underground electric locomotives pulling cars of World War I design. Two Péchot-Bourdon locomotives were preserved in the technical museums of Dresden and the railway museum of Požega. A portion of the Somme battlefield railway continued in operation and has been preserved as the heritage Froissy Dompierre Light Railway. German equipment Orenstein and Koppel GmbH manufactured portable track. Krauss designed a 0-6-0T Zwillinge intended to be operated in pairs with the cabs together. The Zwillinge offered Mallet locomotive performance through tight curves, but damage to one unit would not disable the second. One hundred-eighty-two Zwillinge were manufactured from 1890 to 1903, and shortcomings were evaluated in German South West Africa and China's Boxer Rebellion. An 0-8-0T Brigadelok design with Klien-Lindner articulation of the front and rear axles was adopted as the new military standard in 1901. Approximately 250 were available by 1914, and over two thousand were produced during the war. A Brigadelok typically handled six loaded cars up a 2% grade. Germany also had approximately five hundred 0-4-0T, three hundred 0-6-0T and forty 0-10-0T locomotives of other designs in military service. Deutz AG produced two hundred 4-wheel internal combustion locomotives with an evaporative cooling water jacket surrounding the single cylinder oil engine. Fifty similar 6-wheel locomotives were produced by Deutz. Approximately 20% of the Brigadeloks saw post-war use. Government railways of (Yugoslavia), North Macedonia, Serbia and Poland made extensive use of the military locomotives. Significant numbers were used in Hungary, France, Latvia, Bulgaria and Romania while smaller numbers went overseas to Africa, Indonesia, Japan and North America. Much of the trench railway equipment remaining in Belgium at the end of hostilities was shipped to the Belgian Congo to build the Vicicongo line. British equipment Britain selected a Hunslet Engine Company 4-6-0T design as their standard for the French Decauville 600mm rail gauge; but Hunslet's production of 75 locomotives was insufficient. Baldwin Locomotive Works produced 495 4-6-0T of a less satisfactory American design while Hudswell Clarke and Andrew Barclay Sons &