If w is width of sleepers, s is sleeper spacing and d is depth of ballast then

• A. <img src="/_files/images/civil-engineering/railways/56-17-96-1.png">
• B. <img src="/_files/images/civil-engineering/railways/56-17-96-2.png">
• C. <img src="/_files/images/civil-engineering/railways/56-17-96-3.png">
• D. <img src="/_files/images/civil-engineering/railways/56-17-96-4.png">
• E. <img src="/_files/images/civil-engineering/railways/56-17-96-4.png">