Yes it is central government job. 

Dear Cleint,

The Ministry of Railways is a ministry in the Government of India, responsible for the country's rail transport. Central govt job parted in 16 zones.

the railway jobs not of Central Government job 

Indian Railway Jobs is one of the most prestigious government sector vacancies in India

Indian Railways has it`s own rules which dose not apart its employees from central.

See there are separate rules for employment though it is state owned.

Ofcourse it is Central Govt Job. 

Central Civil Service Conduct and rules was notified on 30th November 1964 and the rule came into effect from the same day of notification. The CCS conduct rules apply to every person appointed to Central civil service or post including civilians in defense of service. The rules don’t apply to railway servant and the person holding a post in the railway board or of the financial commission of railways. 

The job is a central government job. But the persons employed are in the direct employment of railways. It is an undertaking of th he government. The ccs rules do not apply to the railways.

Indian Railways (IR) is India's national railway system operated by the Ministry of Railways

Yes, it is a central government job only, why do you have this doubt?

The railway employees are governed by the Railway Services (conduct) Rules, 1966.

“railway servant” means a railway servant as defined in rule 103 (43*)
of the Indian Railway Establishment Code.
*Railway Servant means a person who is a member of a service or who holds
a post under the administrative control of the Railway Board and includes a post in
the Railway Board. Persons lent from a service or post which is not under the
administrative control of the Railway Board to a service or post which is under such
administrative control do not come within the scope of this definition.
Explanation.- A railway servant whose services are placed at the disposal of
a company, corporation, organisation or a local authority shall, for the purposes of
these rules, be deemed to be a railway servant notwithstanding that his salary is
drawn from sources other than the Consolidated Fund of India.

They are central govt employees but are excluded from central civil service rules. Railways have separate set of rules. Section 2(34) of Railways Act 1989 is clear about the same. And the same is covered by article 309 and 311 of Indian Constitution.

Though apparently it looks like a Central Government Organization but railway has been taken over body which taken over by the Central Government in the year 1907.

1. As per the information mentioned in the present query, and following by the sugmbsequant query, makes it clear that you are right but little confused in your answer cum question.
2. Yes, central rules do not apply on the railway, but it has its own act/ or say rule book.
3. It is the government of India undertaking, not being the central services in itself.