1.   The fourth remains anonymous.

2.   The three front carriages were expected to be towed further down the track to a depot, but the fourth remained jammed between two platforms.

3.   The fourth will remain in Pyongyang until mid-January but leave then if no further aid arrives, he said.

4.   The fourth will remain in the North Korean capital until mid-January but leave then if no further aid arrives, he said.