Great Western Railway launches weed killing campaign 'scratch them with 'Spray' Express. The 'Spray' Express, and you train which deals out death at 20 miles an hour to weeds growing on the Great Western Railways Lines, has started work in the Oswestry district of Shropshire. The train is composed of an engine, three locomotive tenders, holding 9 1/2 thousand gallons of water which have been converted into huge 'water cans' with adjustable jets, a tank truck holding 2000 gallons of chemical in concentrated solution, and guards brake van. Solution a six part of water to one part of weed killer is made up before the train starts. About 400 gallons of weaker are used to every mile of singletrack and 24 miles can be covered by the train without refilling. During the Spring of week killing campaign, 300,000 gallons of spray will be used by the Great Western Railway throughout its system. Photo shows, the 'Spray'express spraying weedkiller over the railway track in the Oswestry district. 21 April 1937