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Short answer rocks.
That being said railroad track ballast is the cover for the subgrade. Ballast has several functions:
* It enables water to drain from the track
* It assists in helping control the thermal expansion of continues welded rail * As a train passes the rails it supports the train * it distributes the weight of the train from the track structure to the subgrade * maintains a smooth running surface for the train to run on
As ballast becomes contaminated with other materials it looses its ability to do some or all of these jobs.
What else can I help you with?
Do rocks eat candles?
No, rocks do not eat candles. Rocks are inanimate objects and do not possess the ability to consume, digest, or metabolize any kind of substance.
Can rocks change from one one kind to another kind any order?
Yes, rocks can change from one kind to another through processes like metamorphism (changing due to heat and pressure) or weathering (breaking down into smaller particles). The rock cycle illustrates how rocks can continuously change from one type to another in any order.
What kind of rocks are in tropical rainforest?
Tropical rainforests can contain a variety of rocks, including igneous rocks (such as basalt and granite), sedimentary rocks (such as sandstone and limestone), and metamorphic rocks (such as marble and schist). The specific types of rocks found in a tropical rainforest will depend on the geologic history and composition of the region.
What kind of rocks that are formed by volcanic activity?
Rocks formed by volcanic activity are called igneous rocks. These rocks form when molten magma cools and solidifies either above or below the Earth's surface. Examples of volcanic igneous rocks include basalt, andesite, and rhyolite.
What kind of rocks do not have layers?
Igneous rocks, such as granite and basalt, typically do not have layers because they form from the solidification of molten rock without the presence of bedding or foliation. These rocks cool and solidify quickly, preventing the development of distinct layers.
How do railroad tracks function?
There are different types of railroad tracks that function in different ways. The first type is the typical track that is known for balancing a train and using a system of levers to activate crossing gates. There is also the kind that run on electricity above the rails or with an electrified third rail.
What does a ballast do in a fluoresent bulb?
reactor ballast
What kind of fossils are dinosaur tracks?
Dinosaur tracks are trace fossils
What contains different kind of fossils?
Rocks, sediment, and soil contain different kinds of fossils, which are the preserved remains or traces of ancient plants and animals. Fossilized bones, shells, imprints, and tracks can all be found in various types of sedimentary rocks.
What kind of tracks does a CD have?
Good ones.
What do rat tracks look like?
It depends on what kind it is really what kind do you got?
What kind of rocks are in volcanoes?
Igneous Rocks.
What kind of foot tracks do zebras have?
big feet
What are Minecraft tracks?
Kind of like train traks
What kind of rocks are formed by in a river?
sedimentary rocks
What kind of rocks forms by recrystallization?
sedimentary rocks
What kind of rocks is formed in the ground?
Solid rocks
