switchback

• POS: Noun
• HYPHEN: switch=back

OXFORD DICTIONARY

switchback, n.
1 Brit. a railway at a fair etc., in which the train's ascents are effected by the momentum of its previous descents.
2 (often attrib.) a railway or road with alternate sharp ascents and descents.

THESAURUS

switchback

L, branch, cable railway, chevron, cog railway, crankiness, crookedness, dogleg, el, electric railway, elevated, elevated railway, embankment, feeder, feeder line, flexuosity, gravity-operated railway, hairpin, horse railway, junction, light railroad, line, main line, metro, monorail, rack railway, rack-and-pinion railway, rail, rail line, railroad, railway, roadbed, roadway, sidetrack, siding, street railway, streetcar line, subway, terminal, terminus, track, tram, tramline, trestle, trolley line, trunk, trunk line, tube, turnout, underground, zag, zig, zigzag, zigzaggery