Replying to Physics--so hot right now (another question)

Ok so since it seems like the cool thing to do, I decided to post yet another physics question:

You are standing in a field by a train track, because thats what you like to do. Then a train of length L comes flying, and i mean flying (well not really, rolling, but quickly) down the track at 4c/5 (4/5ths the speed of light). The question is:

You wanna time how long it will take for the train to pass you. What do you conclude?

[hint* How long is the train?]