I put the spare dynamite on the train tracks
Why would you bomb train tracks?
I want the train derailed.
What you are doing is illegal and you could be tried for mass murder. Don't do it unless you want to be in a Supermax prison for the rest of your life.
This is a paying job.
I don't know who is paying you to derail a train, but they clearly have malicious intent, and you should not be a part of this. You could cause massive loss of life, and you would be the one who is most likely to be caught and prosecuted for the crime. I have to urge you to find another, more legitimate source of income.