Why do railroads use Rail joint

First, technical requirements
Connecting the rails: On a railway line, the rails need to be laid continuously to form a complete track. However, the length of a single rail is limited due to restrictions in the production, transportation and installation of the rail. Therefore, rail joints are needed to connect two or more rails so that they can form a continuous, smooth track for the train to travel on.
Adapting to terrain changes: Terrain changes are inevitable on railway lines. In order to adapt to terrain fluctuations, curve changes, etc., it is necessary to set joints between rails of different lengths in order to fine-tune the track to ensure that the train can run smoothly and safely.

Second, functional guarantee
Distributed train load: The train will produce huge pressure and impact force on the track during the running process. Through rail joints, these loads can be distributed to multiple rails, thereby reducing the wear and damage to a single rail and extending the service life of the track.
Maintain track stability: the rail joint can ensure that the connection between the rail is tight and stable, prevent loosening and dislocation during the train running, so as to maintain the stability of the track and ensure the safety of the train.

Third, convenient maintenance
Easy replacement and maintenance: When the rail is worn, broken and other problems, it needs to be replaced or repaired in time. The use of rail joints can easily remove the problematic rail from the track and replace or repair it, reducing the impact on railway traffic.
Improve construction efficiency: In railway construction, the use of rail joints can simplify the construction process and improve construction efficiency. At the same time, due to the existence of rail joints, the track can be easily fine-tuned to adapt to terrain changes and construction needs.