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Types of Rail Joints
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Tongue and Groove Joint
This type of joint features interlocking rail ends, resembling the tongue and groove technique in woodworking, improving the joint's stability.
Staggered Joint
Staggered joints have rail ends that are offset on opposite sides of the track to help distribute the load and reduce wear.
Fishplate Joint
A fishplate joint involves bolting two fishplates to the rails on either side of the joint, providing a flexible and temporary connection.
Protected Joint
Protected joints have extra reinforcements, like tie plates or braces, to increase the stability and lifespan of the joint.
Welded Joint
Welded joints fuse the rail ends together to create a continuous rail, which eliminates the joint gap and helps in providing a smoother ride.
Oblique Joint
An oblique joint is cut at an oblique angle, with a design focus on reducing the rail end battering and improving the smoothness of the joint.
Joggled Fishplate Joint
This joint uses fishplates that are joggled or offset to hold the ends of rails tightly together, used in repair or when the rail end is damaged.
Suspended Joint
Suspended joints have the rail ends supported by a sleeper that does not directly support the joint, allowing for some vertical play.
Expansion Joint
Expansion joints allow for thermal expansion and contraction of rails, ensuring that track integrity is maintained under temperature variations.
Bolted Joint
Bolted joints connect the rail sections using bolts, and are a basic form of rail joint, but are less secure than welded joints.
Compromise Joint
A compromise joint connects rails of different sizes or profiles to each other, and is useful when transitioning between rail sections.
Square Joint
A square joint has rail ends cut square and often uses fishplates to connect. It's a basic joint type but prone to impact and wear.
Step Joint
Step joints involve connecting rail ends that overlap at different heights to transfer loads more efficiently between rail sections.
Angle Joint
Angle joints have the rails cut at an angle to each other and are jointed using fishplates, offering a compromise between square and staggered joints.
Insulated Joint
Insulated joints are non-conductive and used to interrupt the electrical current flow in rails, often for signaling or track circuit isolation.
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