Full coverage: 2016 Rio Olympics

Interim Brazilian President Michel Temer was on hand for the opening ceremony of the Rio Olympic metro line in Rio de Janeiro.

President Michel Temer attends subway opening.

The president says the new line will provide additional convenience for the residents of Rio and help deal with the transportation crush during the upcoming Olympics.

Brazilian President Michel Temer took a ride Saturday on a new subway line to attend the metro line's opening ceremony.

Line 4 connects downtown Rio to the Olympic park. The line is expected to carry 300,000 people per day, and provide transportation relief during the Olympics.

"Brazil needs peace. Brazil needs harmony. Brazil needs people to jointly solve the crisis that we are facing. The Olympic Games is the very moment for us to do that," said Michel Temer, Brazil President.

Rio Mayor Eduardo Paes said that the new metro line will become an important legacy of the Olympic Games and an important improvement in urban infrastructure.
 
"I firmly believe that the Rio Olympics will change this city from all aspects. It will bring the greatest change to urban transport in the history of the Olympic Games," said Eduardo Paes, Mayor of Rio de Janeiro.

What's worth noting is that the subway cars were manufactured in China by the CRRC Changchun Railway Vehicles Corporation.

What's worth noting is that the subway cars were manufactured in China by the CRRC Changchun Railway Vehicles Corporation.

"We've seen successful operations of Chinese-made-trains on line 1 and line 2. Line number four will use the same Chinese made trains. We have 15 of them altogether," Transportation head of Rio said.

Line four was the hardest to construct of all the lines. Its budget went up to 9.7 billion Real from 5.6 billion Real. Construction was delayed several times, prompting concerns on whether the line could be finished in time.