Ballast - permanent way, Mechanical Engineering


Ballast is the layer of broken stone provided on the formation on which the sleepers rest. The stones are cubical in shape and pass through 50 mm square mesh. The functions of the ballast are:

(a) To distribute the load of traffic to the earthen formation to a safe value.

(b) To act as an elastic bed to absorb the impact of the wheels.

(c) To hold the sleepers firmly in the lateral and longitudinal directions.

(d) To act as a good drainage medium.

(e) To provide a convenient medium to pack the track to the desired levels.

(f) To prevent capillary rise of water which may cause decay/corrosion of sleepers?

(g) To check the growth of vegetation under the track.

The thickness of ballast for a high density BG track is 300 mm, and it is 250 mm for a low density BG track. Figure 4 gives the standard ballast section.

2246_Ballast - permanent way.png

Figure: Standard BG Track Ballast Section

Posted Date: 1/23/2013 12:38:12 AM | Location : United States

Related Discussions:- Ballast - permanent way, Assignment Help, Ask Question on Ballast - permanent way, Get Answer, Expert's Help, Ballast - permanent way Discussions

Write discussion on Ballast - permanent way
Your posts are moderated
Related Questions
Derive the relation ship between volumetric efficiency & clearance.

A gear drive is needed to transmit a maximum power of 22.5KW. The velocity ratio is 1:2 and r.p.m. of the pinion is 200. The centre distance between the shafts can be taken as 600m

Keywords used in appropriate technology: Hill Roads : Roads in hilly and mountainous terrain. Landslides : The slippage of mass of hill face. Retaining Walls : Str

Copper-Lead Alloys Copper-lead alloys, having a large percentage of lead have determined a considerable employ as bearing material lately. Straight, copper-lead alloys of such

Q. Explain External Pressure Design? Determine requirements for external pressure based on the expected operation of the vessel, and add a suitable operating margin to establis

Derive the finite element formulation  for a tapered bar element using Galerkin's method.                                                 1- Start with. 2- Use and as shap

Q. Describe about Austenitic stainless steels? Austenitic stainless steels (300 series) generally exhibit very good corrosion resistance in sulphuric acid service for low conce

Q. Application of hot service insulation? Provision for the expansion of hot equipment shall include the installation of expansion springs in circumferential banding securing i

Various applications of numerical methods in the field of m=numerical engineering.

A competitor in a hill-climb event finds during practice that his car becomes airborne at a particular point on the hill.  Shortly after landing the lowest point in the car just co