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WorksheetsTrack Engineering - Ballast & Drainage
Total questions: 10
Worksheet time: 6mins
What is the typical size of ballast?
10mm
70mm
100mm
25mm - 64mm
What are the functions of ballast? (Select more than one)
Free draining
Allows the track to be adjusted by manual/mechanical means
Gives vertical and lateral stability to the track
To make the track look neat and tidy
What are the properties of ballast? (Select more than one)
Angular, strong and durable
Regular in size
Smooth
Shiny
Well consolidated
What is the minimum shoulder width?
375mm - 450mm
250mm
450mm - 600mm
1m - 1.5m
What is the minimum shoulder height?
250mm
300mm
1m
125mm
Drainage should allow water to disperse away from the railway and prevent flooding...
True
False
What is the minimum crossfall in the track substructure?
1:5
1:500
1:20
1:100
What is the purpose of a catchpit? (Select more than one)
To allow inspection and cleaning
To supply clean water to the environment
To protect the ballast membrane
To allow drains to be kept clean and free of debris
What evidence is there of a blocked drain? (Select more than one)
Catchpit full of ballast
Dry catchpits
Flooded catchpits
Vegetation growing in the four foot
How can we locate blocked drains? (Select more than one)
Visual inspection
Cameras
Throw ballast down the catchpit
Water dye test
