In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.
Q: The lack of an automatic braking system that could have prevented the Philadelphia Amtrak crash wasnt driven by a lack of funding. It just takes a while. They (Congress) just passed it in the recent past.
A:
infrastructure