Joint detail in continuously welded rail (CWR): A welded rail joint is generally arranged to be…

Introduction / Context:
Even in welded track, field welds join rail lengths. The position of a weld relative to sleepers affects local stiffness and stress concentration. Good practice avoids placing the weld directly over a support to minimize impact loads and reduce the risk of cracking.

Given Data / Assumptions:

• Standard sleeper spacing with elastic fastening systems.
• Field or flash-butt welds used to create long welded rails.

Concept / Approach:
Placing the weld midspan (suspended) between two sleepers avoids the abrupt stiffness change that would occur if the weld coincided with a support. This reduces dynamic impacts and thermal stress concentration at the joint.

Step-by-Step Solution:

Verification / Alternative check:
Track standards typically mark weld positions at a defined distance from sleeper centers, ensuring a suspended joint.

Why Other Options Are Wrong:

• Supported on sleeper/plate/chair: Increases stiffness discontinuity and impact, undesirable for weld longevity.
• None of these: Incorrect because a standard practice exists—suspended position.

Common Pitfalls:

• Confusing fish-plated joints (supported) with welded joints in CWR practice.

Final Answer:
suspended between adjacent sleepers