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Stones Alongside Railway Tracks
Why Are There Stones Alongside Railway Tracks?
Ashish
Traveling in a train is an amazing experience in itself. You get
to witness the stunning vistas of nature, sprawling fields,
cities teeming with people, or endless stretches of land with no sign of
any life whatsoever.
One more thing that you almost always see throughout your
train-journey are those small stones lying alongside the track on which your
train races?
Have you ever given any thought as to why there are almost always
stones alongside a railway track?
Track Ballast
To start with, the stones that you see lying close to the railway
tracks are collectively called track ballast.
It basically forms the trackbed on which the railway sleepers are
kept. Track ballast is packed between the sleepers, in the areas below, and on
the sides of railway tracks.
I can already hear the question beginning to form in your head;
what’s a sleeper?
A railway sleeper is a rectangular support that is usually kept
perpendicular to the tracks. Sleepers are known by a few other names too, like
a railroad tie or a crosstie.
These are usually made of wood or pre-stressed concrete, although
the latter is more widely used today. The function of railway sleepers is to
hold the rails upright and properly spaced.
Why Specifically Those Stones?
It’s not like the construction crews put just any stone they find
around the tracks. That wouldn’t do the trick.
For instance, if you put smooth, round pebbles in the ballast,
then they might roll or slide over each other when a train passes over the
tracks; therefore, they would fail at their main job – providing
solidarity to the tracks.
Given that fact, you need stones of a specific type that won’t
move around too much, except by kids chucking stones near the tracks, of
course!
In order to guarantee that the stones stay in place, they use sharp
and edged stones in the ballast. Interesting, huh?
Is That All Track Ballast Does?
In fact, the track ballast serves a number of purposes.
First of all, it makes sure that tracks stay in place when
super-heavy trains roll by on them.
It also plays an instrumental role in keeping any vegetation in
check that might grow around the tracks (and make the ground beneath the tracks
weaker).
Another important aspect of track ballast is that it seals
out any water that may be around the tracks to actually reach the tracks on a
regular basis.
That doesn’t mean the ballast completely insulates the tracks from
water, which would be impossible, but it does facilitate water drainage
around and beneath the tracks so that water doesn’t stay near the tracks and
compromise the solidarity of the ground.
A novel technique to reduce
vibrations
The excessive use of railway lines for transportation poses a
threat to the buildings in the areas near the tracks due to the immense
vibrations the tracks experience when a high speed locomotive moves over them.
Also, the loud noise that is produced when a train moves rapidly
also the tracks is also a nuisance to the surrounding areas.
In order to minimize these vibrations, a fairly simple clamping
technique is employed using a dynamic vibration absorber.
It consists of EPDM or Ethylene Propylene
Diene Monomer rubber because of its high resistance to heat,
water and other mechanical strains.
As a result, the vibrations are reduced to a great extent and the
noise is also diminished to a bare minimum.
What we’re trying to say should be
clear… Picking up stones from around the tracks on a pleasant, sunny day and
chucking them out into the nearby forest is not an ideal way to release your
stress!
Ashish is a Science graduate (Bachelor of Science) from Punjabi University (India). He spends a lot of time watching movies, and an awful lot more time discussing them. He likes Harry Potter and the Avengers, and obsesses over how thoroughly Science dictates every aspect of life… in this universe, at least.
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