English: express coach service
Welsh: gwasanaeth coetsys cyflym
Subject: Trafnidiaeth
Welsh definition: An express coach service has limited stops over a long distance; usually over 30 miles.
Notes: Cymharer â'r diffiniadau ar gyfer gwasanaeth bysiau lleol, gwasanaeth bysiau pellter hir, a gwasanaeth bysiau cyflym.