text:  The main terminal of the Philippine National Railways lies within the city . One commuter railway within Metro Manila is in operation . The line runs in a general north @-@ south direction from <unk> ( <unk> ) toward <unk> . The Port of Manila , located in the vicinity of Manila Bay is the chief seaport of the Philippines . The <unk> River Ferry Service which runs on the <unk> River is another form of transportation . The city is also served by the <unk> <unk> International Airport and Clark International Airport . 
  