o ‧ ver ‧ ground /ˈəʊvəɡraʊnd $ ˈoʊvər-/ BrE AmE adjective [only before noun]
[ Word Family: noun : ↑ ground , ↑ underground , ↑ grounding , GROUNDS ; adjective : goundless, ↑ underground ≠ ↑ overground , ↑ grounded ; verb : ↑ ground ; adverb : ↑ underground ]
used to describe a train system that runs on the surface of the ground rather than below it OPP underground :
an overground railway