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I really emplore you to find some open data and just set your own challenges. I did that with Citibike open data and that snowballed into a 300-line 17-hour script that won me a trip to California. I've never heard the term Marey Chart, even though I'm now doing my third course related to railway transportation. We just call them time-space diagrams or blocking diagrams if they include the train's block occupancy times, like this visualization I made in Matlab a month ago: