During the colonial period, the public sector in India covered several industries. However, out of the options given, only the railways were covered under the public sector. Let's understand why the other industries mentioned were not included.

Railways:
- The railways were a crucial sector during the colonial period as they played a significant role in the transportation of goods and people across the country.
- The British government recognized the strategic importance of the railways and took control of their construction and operations.
- The railways were considered a public utility and were administered by the government to ensure efficient transportation and communication.

Animation:
- The animation industry did not exist during the colonial period as it is a relatively modern phenomenon.
- Animation as we know it today only emerged in the late 19th and early 20th centuries with the invention of motion picture technologies.
- Therefore, the concept of animation being covered under the public sector during the colonial period is not applicable.

Information Technology:
- The information technology industry, as we understand it today, did not exist during the colonial period.
- The development of computers, software, and other IT infrastructure happened much later, primarily during the late 20th century.
- The public sector's involvement in the IT industry also came about in the post-independence era when the Indian government took initiatives to promote technological advancements.

In conclusion, out of the options provided, only the railways were covered under the public sector during the colonial period. The animation and information technology industries did not exist at that time, and their development and involvement of the public sector happened in subsequent years.