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* Train tracks does not take up 70% of cities.

* Trains are not constant, they come more seldom

* Trains are _extremely_ predicable. Cars are the opposite. This is why trams in i busy inner city are more safe than cars. You know exactly where that tram is going and at what speed.

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Yes, and on top of that if there were a train line on campus with any high speed train traffic it would be surrounded by tall fences and the pedestrians would be provided with off-level crossing. (One or more tunnels and/or bridges)

This is exactly the case a little ways away at Tufts University in the city of Medford. There's a busy train line that runs through the campus and it's fenced off. Students do sometimes find ways in there and use the right-of-way as a shortcut. Sometimes they get killed doing this--which is why the fence is there in the first place.

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