MIT eliminated its escort service in 1995. http://tech.mit.edu/V115/N45/safewalk.45n.html
That was the top result that I got by Googling MIT walking escort service for students.
Perhaps they have reinstated it.
Several schools that we visited while looking at colleges mentioned their safety phones located about every 40 feet at some schools, but none of them mentioned the escort service while we were touring. They might have had them, not not mentioned them. It has been some years since we were looking at colleges, so perhaps they instituted them in the meantime.