Hot rolling is the correct method for manufacturing railway tracks. The process involves heating a large metal ingot and passing it through a series of rolling mills to shape it into the desired form. This method is widely used in the manufacturing industry due to its numerous advantages.

The hot rolling process for railway tracks can be explained in detail as follows:

1. Heating the ingot: The first step in hot rolling is to heat the metal ingot to a high temperature. This is typically done in a furnace to make the metal more malleable and easier to shape.

2. Roughing mill: Once the ingot is heated, it is passed through a roughing mill. This mill consists of a series of heavy rollers that gradually reduce the thickness of the metal while increasing its length. The metal is repeatedly passed through the mill until the desired dimensions are achieved.

3. Finishing mill: After the roughing mill, the metal is passed through a finishing mill. This mill has a set of rollers with a smoother surface to further refine the shape and dimensions of the metal. The finishing mill ensures that the railway track has a smooth surface and meets the required specifications.

4. Cooling and straightening: After the metal has been shaped by the rolling mills, it is cooled and straightened. This is done to remove any residual stresses and ensure that the railway track remains straight and stable.

- The hot rolling process offers several advantages for manufacturing railway tracks:

- High strength: Hot rolling produces railway tracks with high strength and durability. The repeated heating and rolling process refines the grain structure of the metal, resulting in improved mechanical properties.

- Consistency: Hot rolling allows for precise control over the dimensions and shape of the railway tracks. The rolling mills ensure uniformity in thickness and length, resulting in consistent and reliable products.

- Cost-effective: Hot rolling is a cost-effective method for manufacturing railway tracks. The process is efficient and can be easily automated, leading to higher production rates and lower labor costs.

- Versatility: Hot rolling can be used to produce railway tracks of various sizes and shapes. The process can accommodate different types of metals, such as steel or iron, depending on the specific requirements of the railway system.

- Conclusion: In conclusion, hot rolling is the most suitable method for manufacturing railway tracks due to its numerous advantages. The process ensures high strength, consistency, cost-effectiveness, and versatility in producing railway tracks.