Don't be dead wrong. Trains come on any track, at any time, from any direction, so look both ways when crossing. Look for freight trains as well as Metro Blue Line trains. One train may obstruct your view of another. Don't cross until you can see all tracks clearly.
Trains travel at different speeds - some fast, some slow.
Don't take foolish chances when trying to cross. Metro Rail trains are quiet and fast, so listen for the horn or bell.