Here is some sentences:
I went to catch the train which departs at five (1)
I went to cath the train departing at five (2)
BUT, I have heard they also use like this:
I went to catch the train (which) departs at five (3)
It means, they omit the relatives pronouns, but may it seems difference from the sentence (2) above?
3. I went to catch the train departs at five.