Pros:

Train looks good
Works pretty well with the story
How did you know I love trains?

Cons:

Short
Bots are extramely stupid at some points
The intro is too quiet, you should add some train noise
and possibly a dialouge

Conclusion:

It needs some bugfixes, it can really annoy you right now, for example, you let a bot save another bot, you notice that the bot is coming to you instead, you try to save the bot, it is dead before you get there, and before you get back, one of the bots have jumped off, and the other has alerted the tank.

That really happened.

But it's still awesome, because it is a completely new idea.