Ling Tong asked:


Railway ties rectangular objects tt provide basis railway tracks. Sleepers called, placed regular intervals 90 angles tracks. te place, tracks tied bonds. Time, ties we wood Todayusually concrete. Steel plastic ao manufacture essential structures railway. placed ae track ballast, crushed stone usually heavy. Ts helps kp ties pe provide appropriate drainage flexibility contract expand changing temperatures. various types bonds railway sector transportation industry. Te include: - blocks stone. format, pair stone block placed ground chair rails them. Ty we effective beginning rail horses we common form transport. Wn heavier locomotives use, blocks shown effective be couldn't maintain proper gauge. Cd ud soft earth. Today, however, ud form slab stone tt helps tracks place. - Ties wood. Hardwood, especially oak, preferred type wood bonds. railway lines using treated softwoods, replaced me easily. Wooden ties heavily covered creosote me tm durable. We wooden ties ones tt frequently American railways, decompose easily, especially we bonds tied tracks. - Links concrete. Ties concrete withstand heavier loads require se level maintenance me wood. - Links steel. mainly ud track storms. lighter weight down. resistant insect damage. Despite advantages, bonds steel prone mold replaced frequently types wood. - Plastic Ties. relatively idea world rail. ties recycled plastic rubber vy durable. advantage ud replace wooden ties ud replace entire track, wh ce replacing plastic concrete. Wn bonds placed tracks, interval bn feet. tie plates fasten rails ties ps bolts driven th ensure lanes remain place. North America, using lane ud ts purpose, Europe, square-headed bolts. ce concrete ties, steel clips ud hold pe ballast added.