Definition: You are given a sentence in Persian. Your job is to translate the Farsi sentence into English.
Input: به از خط خارج شدن قطار حامل مواد شیمیایی در بیرون شهر فکر کنید.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think about a chemical train derailment in a rural county.