Tirunelveli to Thiruchendur

One third of the passengers that came in Tirunelveli train, got down at srivaikundam and 30 passengers boarded the train in that station.
Among the rest, half of them got down in the next station and 15 passengers boarded the train in Kayal.
In that station 50% of the passengers got down.
Finally 30 passengers got down at Thiruchendur. 

Now the question is how many passengers were there in the Tirunelveli train at the beginning?

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