Ballast cleaner

A ballast cleaner (also known as an undercutter) is a machine that specialises in cleaning the railway track ballast (gravel, blue stone or other aggregate) of impurities.

Over time, ballast becomes worn, and loses its angularity, becoming rounded. This hinders the tessellation of pieces of ballast with one another, and thus reduces its effectiveness. Fine pieces of granite, like sand, are also created by attrition, known simply as "fines". Combined with water in the ballast, these fines stick together, making the ballast like a lump of concrete. This hinders both track drainage and the flexibility of the ballast to constrain the track as it moves under traffic.

单词	Ballast cleaner
释义	Ballast cleaner 原声例句科学大揭秘 There are also machines called ballast cleaners that specialize in cleaning track ballast, which reduces the amount of manual labor required. 还有一种被称为道砟清洁器的机器，专门用于清洁轨道道砟，从而减少了所需的体力劳动。英语百科 Ballast cleaner A ballast cleaner (also known as an undercutter) is a machine that specialises in cleaning the railway track ballast (gravel, blue stone or other aggregate) of impurities. Over time, ballast becomes worn, and loses its angularity, becoming rounded. This hinders the tessellation of pieces of ballast with one another, and thus reduces its effectiveness. Fine pieces of granite, like sand, are also created by attrition, known simply as "fines". Combined with water in the ballast, these fines stick together, making the ballast like a lump of concrete. This hinders both track drainage and the flexibility of the ballast to constrain the track as it moves under traffic.
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