. Electric railway journal . ads regardless of speed: 20,000 lb. per axle whenthe axles are spaced as follows: 4 ft. 6 in., 14 in., 4 ft. 6 in., 14 ft. 6 in., etc., or 20 ft. 6 the rear and front axles of cars in a train. For bridges of spans up to 75 ft. the companyuses either reinforced concrete or steel incased inconcrete, because such designs conduce to lower main-tenance. For long spans, plate-girder bridges are pre-ferred to open-girder designs, particularly on accountof greater ease in painting. Open girders have beenfound rather annoying at some railroad crossingsowing
. Electric railway journal . ads regardless of speed: 20,000 lb. per axle whenthe axles are spaced as follows: 4 ft. 6 in., 14 in., 4 ft. 6 in., 14 ft. 6 in., etc., or 20 ft. 6 the rear and front axles of cars in a train. For bridges of spans up to 75 ft. the companyuses either reinforced concrete or steel incased inconcrete, because such designs conduce to lower main-tenance. For long spans, plate-girder bridges are pre-ferred to open-girder designs, particularly on accountof greater ease in painting. Open girders have beenfound rather annoying at some railroad crossingsowing to corrosion from locomotive gases. The smalltruss members, especially, are rapidly weakened bythe gases if they are not carefully watched and fre-quently painted. Some bridges are entirely maintained by the com-pany, some are jointly maintained with municipalities,and others by a municipality alone. Monthly in-spection reports are rendered by the roadmasters onall bridges, viaducts, trestles, etc. The roadmasters Plate XVII. Lift Rails at Draw of Plank Road Bridge Over the Hackensack River
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