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I have never created a multimodal network from scratch before. I want to use General Transit Feed Specification (GTFS).txt files for a New York MTA public transportation network.

What files do I need to begin the process before I even ask about the steps to be performed in QGIS? I already have a lions street file.

closed as too broad by Vince, Jochen Schwarze, whyzar, JGH, Mark Ireland Oct 9 '18 at 13:55

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.