Fill in the Blanks (Reading & Writing)

Railway timetables must balance passenger demand with the physical limits of track capacity, since trains cannot —overtakeovercomeundertakeoverrun one another on a single line. Planners therefore build in buffer times to —absorbabsorbedabsorbingabsorption minor delays without disrupting the entire network. Even so, a single late-running service can —ripplerattleripenrumble through connecting routes for hours.