特別急行
Meanings
1
limited express (ticket-required)
A train service requiring a limited-express ticket in addition to the base fare. Used by JR, Seibu, Kintetsu, and others. Often abbreviated to 特急.
To ride a JR limited express, you need a limited-express ticket in addition to the basic fare ticket.
2
A train service making a limited number of stops, but not necessarily requiring a supplementary ticket. Used by Keiō, Keikyū, Hankyū, Hanshin, and others. Often abbreviated to 特急.
The Keiō Line limited express stops only at major stations between Shinjuku and Keiō-Hachiōji.