Concrete sleeper:
Concrete sleepers are the most suitable type of sleepers that require no anchoring arrangement to account for the creep of rails. Creep refers to the longitudinal movement of rails due to continuous traffic loads and temperature variations. Concrete sleepers offer several advantages that make them ideal for resisting the creep of rails.

Advantages of concrete sleepers:
1. High strength: Concrete sleepers are highly durable and have a high compressive strength, which allows them to withstand heavy loads and resist rail creep effectively.

2. Stiffness: Concrete sleepers have a high modulus of elasticity, making them rigid and resistant to deformation. Their stiffness reduces the rail's ability to move longitudinally, minimizing the potential for creep.

3. Weight: Concrete sleepers are relatively heavy compared to other types of sleepers such as wooden or steel sleepers. The weight of the sleepers provides additional stability and reduces the likelihood of rail movement.

4. Ballast support: Concrete sleepers provide excellent support to the ballast, which is the layer of crushed stones beneath the track. The ballast helps distribute the load from train traffic, reducing the stress on the sleepers and minimizing creep.

5. Longevity: Concrete sleepers have a longer lifespan compared to other types of sleepers. This durability ensures that they can effectively resist rail creep over an extended period without the need for frequent maintenance or replacement.

6. Uniformity: Concrete sleepers can be manufactured with consistent dimensions and properties, ensuring uniformity across the track. This uniformity helps maintain the track's stability and minimizes the potential for rail creep.

7. Resistance to environmental factors: Concrete sleepers are resistant to various environmental factors such as moisture, temperature variations, and chemical exposure. This resistance ensures that the sleepers remain stable and can effectively resist rail creep under different conditions.

In conclusion, concrete sleepers are the most suitable type of sleepers that require no anchoring arrangement to account for the creep of rails. Their high strength, stiffness, weight, ballast support, longevity, uniformity, and resistance to environmental factors make them ideal for resisting rail creep effectively.