By Joanie Zhao
Posted 7 months ago

Do you know the causes and effects of fat edges on rails?

Rail Infrastructure

banner image

Do you know the causes and effects of fat edges on rails?


1. The track is too rigid, and irregularities on the track cause huge power to the wheels;

2. There is a large difference in vehicle speed through the curve, resulting in eccentric load on the inner and outer rails, or due to improper super-elevation settings;

3. Sliding of wheels;

4. The steel is of poor quality.

â—†Inspection method

1. Visually inspect and use a ruler or depth gauge to measure,

2. Use a profilometer to measure.

â—†Development results

1. After the fat edge is generated, if it is not repaired in time, it will affect the train operation.

2. Affects track status inspection, including manual static inspection and track inspection vehicle dynamic inspection for track gauge measurement.

3. The fat edge of the rail end of the ordinary joint will affect the rail seam setting effect and cause blind seams; the fat edge of the insulating joint will cause the insulated rail end to be extruded and cracked. Severe fat edge will cause the insulating joint to be connected and the insulation will fail, resulting in Red light band.

4. The sharp edge produced by the point rail will cause the point rail and the basic rail to not be in close contact, causing the switch to fail. When the train passes, the extrusion causes the fat edge between the point rail and the basic rail, which may cause pieces of the point rail to fall off.

â—†Repair method

1. When the fat edge is larger than 0.3mm, it needs to be repaired. The fat edge of the rail can be processed by grinding (or milling).

2. For fat edges caused by superelevation setting of the curve, the curve parameters should be optimized while grinding rails. It is advisable to adjust the superelevation settings before grinding the rails.

3. Rails that exceed the service limit should be replaced.

â—†Preventive Action

1. Select high-strength grade rails that match the operating conditions to avoid or reduce the wheel-rail contact pressure stress exceeding the rail yield strength value, which can reduce the occurrence of fat edges.

2. Set the curve super height reasonably to prevent the lower rail from bearing excessive wheel-rail contact compressive stress load.

3. Improve the smoothness of the joint position, improve the elastic foundation under the joint rail, and reduce the impact load when the wheel passes the joint.

4. Periodically polish the rails and joints, repair the rail profile in a timely manner, and optimize and improve the wheel-rail contact relationship.

5. To prevent the fat edge of point rail, the top surface of point rail and the basic rail can be chamfered before the point rail is put on the road. When replacing the tip rail, try to replace the basic rail simultaneously; if it cannot be replaced simultaneously, it is necessary to measure and adjust the reduction value of the tip rail after replacement to avoid premature stress on the tip rail.



To continue reading Register Now or Login

Suggested Articles for you

Export - Posted one year ago

Railway track maintenance equipment!

Railway track maintenance equipment! Track maintenance refers to the activities carried out to ensure that rail tracks are in good condition and safe for train operations. It involves the inspection, cleaning, repair, and upgrading of track components such as rails, sleepers, ballast, ties, switches, and crossings. Proper track maintenance is essential for ensuring safe and reliable train operations, reducing the risk of derailments, improving ride quality, enhancing train speeds and reducing operating costs. There are several small machines used for track maintenance. Some of them are: Rail Drill: Used to drill out existing holes in rails and install bolts for rail joints. Rail Grinder: Used to grind the surface of rail tracks to the correct profile to reduce noise and improve ride quality. Rail Saw: Used to cut rails to length and to make specialized cuts for rail joints or curves. Spike Pullers: Used to remove spikes from ties during rail replacement. Tie Tamper: Used to pack ballast under the ties and level the track to ensure stability. Ballast Regulator: Used to distribute ballast evenly along the track to ensure proper drainage and stability. Rail Lifter: Used to lift rails off of the ties during rail replacement or track maintenance. These machines can be used by maintenance crews to perform maintenance activities and repair on the tracks more efficiently and safely. Jodie Yuan #trackmaintenance   #trackconstruction   #railcutter   #railgrinding   #railtamping   #raildrilling   #railwrench

Read Full Article

Joanie Zhao - Posted one year ago

Why you need a railway concrete sleeper bolt drilling machine?

The Railway Concrete Sleeper Bolt Drilling Machine plays a crucial role in railway maintenance work, offering several important benefits. Here are some key points highlighting its significance: Precision and accuracy: Railway tracks require secure fastening to ensure stability and safety. The bolt drilling machine provides exceptional precision and accuracy when drilling bolt holes in concrete sleepers. This ensures that the bolts fit perfectly, preventing any potential issues or hazards caused by loose or misaligned tracks. Time and labor savings: Manual drilling of bolt holes in concrete sleepers is a labor-intensive and time-consuming process. The bolt drilling machine significantly reduces the time and effort required for this task. It automates the drilling process, enabling faster completion of railway maintenance projects and reducing labor costs. Consistency and quality: Maintaining consistent quality across all bolt holes is essential for the overall integrity of the railway tracks. The machine ensures uniform drilling depth and diameter, eliminating variations that can compromise the structural stability of the tracks. This consistent and high-quality fastening enhances the overall reliability and longevity of the railway system. Increased productivity: The efficiency of the bolt drilling machine allows railway maintenance crews to accomplish more work in less time. With its high drilling speed and capacity, the machine can handle a large volume of drilling tasks, contributing to increased productivity and project throughput. Versatility and adaptability: Railway networks often have different sleeper sizes and designs. The bolt drilling machine is designed to be versatile and adaptable, capable of accommodating various sleeper specifications. This flexibility makes it suitable for a wide range of railway maintenance projects, regardless of the specific track configuration. Enhanced safety: Railway maintenance work involves potential hazards, and the bolt drilling machine incorporates safety features to protect operators. These may include safety guards, emergency stop buttons, and ergonomic designs to minimize operator fatigue and reduce the risk of accidents during operation. Longevity and durability: Railway infrastructure requires long-lasting solutions. The bolt drilling machine is constructed with robust materials and engineered to withstand the demanding conditions of railway maintenance work. Its durability ensures reliable performance over an extended period, reducing maintenance and replacement costs.

Read Full Article

Joanie Zhao - Posted one year ago

Why do regular ballast bed tamping work insist on small tamping machine?

Regular ballast bed tamping work often involves manual labor for several reasons: Flexibility and Adaptability: Manual work allows the tamping crew to assess the condition of the ballast bed and make real-time adjustments based on their expertise. They can identify specific areas that require additional or less compaction and adjust the intensity and direction of the tamper accordingly. Manual work enables the crew to adapt to varying conditions, such as changes in the ballast quality or track geometry. Precision and Control: Manual tamping provides a higher level of precision and control compared to automated or mechanical methods. Experienced workers can apply the right amount of force and distribute it evenly, ensuring proper compaction of the ballast bed. They can also detect any irregularities, such as soft spots or voids, and address them promptly. Safety Considerations: Manual tamping allows workers to visually inspect the ballast bed and identify any potential safety hazards, such as loose fastenings, damaged sleepers, or track misalignments. These issues can be addressed immediately, reducing the risk of accidents or derailments. Manual work also enables workers to maintain a safe distance from moving trains and machinery, ensuring their safety during the tamping process. Cost Considerations: Manual tamping is often more cost-effective, especially for smaller maintenance projects or locations with limited access for machinery. Automated or mechanical methods may require significant investment in specialized equipment, which may not be economically feasible for every project. Manual tamping can be performed with basic hand tools and a smaller crew, reducing equipment costs and operational expenses. While manual tamping work has its advantages, it is worth noting that the railway industry is constantly evolving, and there are automated and semi-automated solutions available for ballast tamping. These technologies aim to enhance efficiency, accuracy, and productivity while reducing physical labor. However, the decision to adopt such methods depends on various factors, including the project scale, budget, and specific requirements of the railway network.   More Rail tamping solutions please contact 008615015909102  email:

Read Full Article