In case of railway infrastructure, the thickness of ballast for high density broad gauge track is ______ and for medium density track is _________.

Explanation:

Ballast

It is the granular material that is placed and packed below and surrounding the sleeper.

The thickness of ballast for high-density broad gauge track is 300 mm and for medium, density track is 250 mm

Ballast Requirement for fish plated Track:

Functions:

1. It transmits the load from sleepers to subgrade

2. Provide good drainage.

The characteristics of ballast are:

1. The depth of ballast for different type tracks is:

For BG: 20-25 cm (in General)

For MG: 15-20 cm

For NG: 15 cm

Important Points 2. The quantity of stone ballast required for one-meter length of track for different type of tracks is as follow:

For BG – 1.036 m3.

For MG – 0.71 m3.

For NG – 0.53 m3.

3. The size of ballast depends on the type of sleeper and location of track and its is given as:

For Wooden sleeper - 5 cm

For Metal sleeper - 4 cm

For turnouts and cross-over - 2.5 cm

Additional InformationThe track or permanent way is the railroad on which trains run. It consists of two parallel rails fastened to sleepers with a specified distance between them. The sleepers are embedded in a layer of ballast of specified thickness spread over level ground known as formation.

Following is the table for standard width of formation