noun, noun which may take the genitive case particle 'no'
high speed; rapidity; swift movement
A noun or の-modifying noun for being fast or making rapid progress. As a general adjective, it is less everyday than 速い or 高速 and often sounds written, technical, or descriptive.
快速を誇る新型船が就航した。
A new high-speed vessel has gone into service.
快速の通
A high-speed communications environment is in place.
noun
rapid-service train; rapid train
Short for 快速電車 or a rapid-service train. It usually skips some stops but is generally not as fast or as limited-stop as an express; exact railway categories vary by company and line.
See also: 快速電車
次の快速は三番線から発車します。
The next rapid train will depart from platform three.
快速に乗れば、各駅停車より早く着く。
If you take the rapid train, you will arrive earlier than on the local train.