One line per train, walked out of the archive by vehicle. Time runs left to right, the corridor runs top to bottom, and a station sits at its measured running time from Medford/Tufts — so a straight line is a train at the usual speed, a flat step is a stop, and the long flat step at the top is the terminus layover. Drag across it to zoom in, double-click to zoom back out.
The same runs, each slid sideways until its Magoun Square stop sits at zero. One faint line per train, so the width of the smear is how much the same trip varies; the solid line is the median and the band is the 10th to 90th percentile of the trains that got that far.
Each cell is the median of actual minus scheduled for the trains booked into one 15-minute slot, so warm is late and there are about two trains behind a cell.