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Which are correct:

1-I looked at the watch. It was two hours before the train left.
2-I looked at the watch. It was two hours before the train would leave.

3-I looked at the watch. It was two hours until the train left.
4-I looked at the watch. It was two hours until the train would leave.
Comments  
navitasanWhich are correct:
Based on how they were constructed, none appeared to be correct. Do you mean to say: I looked at my watch. The train won't leave for another two hours?
Thanks Dimsumexpress.

Yes. I looked at my watch and saw that it was two hours before the time at which the train was scheduled to leave.

For instance, if the train was supposed to leave at 3 o'clock, I looked at my watch and saw that it was 1 o'clock.