What cast does E sreedharan belongs to?

E Sreedharan does not belong to a specific "caste" in the traditional sense. The concept of caste is largely a Hindu social system, and E Sreedharan is not known to be a practicing Hindu.

He is a prominent civil engineer, and his identity is primarily associated with his profession and accomplishments, rather than any particular caste.

It's important to remember that caste is a complex and sensitive topic, and focusing on an individual's caste can be unhelpful and potentially harmful.