THOUSANDS of seats will be removed from Melbourne's existing trains over the next two years by new operator Metro to squeeze in more passengers.

And the trouble-plagued air-conditioning units on the city's 92 Comeng trains - which failed dramatically in last summer's heat - will not need to be completely overhauled for another six years.

Contracts worth about $9 billion signed in August by the Government with Metro and Yarra Trams' new operator Keolis were posted on the Department of Transport's website yesterday.

Financial details are deleted, but the details of key projects were included.