Rail creep control: Anti-creep anchors are fixed to the rail primarily by which method of attachment?

Introduction / Context:
Rail creep is the longitudinal movement of rails under thermal cycles and traffic loads. Anti-creep (rail) anchors are devices fitted to the rail base to bear against sleepers, limiting longitudinal slippage and maintaining joint or neutral temperature positions.

Given Data / Assumptions:

• Conventional jointed or long-welded rail with anchors at specified spacing.
• Anchors are add-on fittings that engage the rail foot and sleeper.

Concept / Approach:
Modern anti-creep anchors are typically clamped or sprung onto the rail base, developing a firm grip without welding. The anchor bears against the sleeper side faces through the fastening, resisting rail movement. While the design uses spring steel characteristics, the method of fixation is practically a clamping action around the rail foot.

Step-by-Step Solution:
1) Identify required function: convert longitudinal rail force into bearing against sleeper.2) The device must grip the rail foot securely: achieved by clamping form.3) Installed anchors sit snugly on the rail base, preventing creep.

Verification / Alternative check:
Manufacturer manuals show drive-on or snap-on anchors that clamp around the rail base; welding is not standard for anchors due to metallurgical and maintenance concerns.

Why Other Options Are Wrong:

• Pure wedging is not the recognized secure method; it is unreliable.
• “All of the above” is incorrect since welding and wedging are not standard attachment methods.
• Spring action exists, but the functional attachment is by clamping the rail base.

Common Pitfalls:

• Assuming anchors are welded—this complicates maintenance and rail metallurgy.

Final Answer:
Clamping to the rail base.