Types
Concrete sleepers can be of one piece of uniform dimensions, or of variable dimensions. Concrete sleepers can also consist of two separate blocks connected by a steel tie rod. Exceptionally, the concrete can be poured as two separate longitudinal slabs as has been used in Namibia.
Slab track consists of a continuous concrete roadbed without division into separate sleepers, and these are most often used in tunnels.
Austrak has developed a concrete Timber Replacement Sleeper that can be inter-dispersed with timber sleepers. These sleepers have a similar profile to the timber but have the benefits of concrete - especially when it comes to holding gauge.
Read more about this topic: Concrete Sleeper
Famous quotes containing the word types:
“As for types like my own, obscurely motivated by the conviction that our existence was worthless if we didn’t make a turning point of it, we were assigned to the humanities, to poetry, philosophy, painting—the nursery games of humankind, which had to be left behind when the age of science began. The humanities would be called upon to choose a wallpaper for the crypt, as the end drew near.”
—Saul Bellow (b. 1915)
“If there is nothing new on the earth, still the traveler always has a resource in the skies. They are constantly turning a new page to view. The wind sets the types on this blue ground, and the inquiring may always read a new truth there.”
—Henry David Thoreau (1817–1862)
“The wider the range of possibilities we offer children, the more intense will be their motivations and the richer their experiences. We must widen the range of topics and goals, the types of situations we offer and their degree of structure, the kinds and combinations of resources and materials, and the possible interactions with things, peers, and adults.”
—Loris Malaguzzi (1920–1994)