mildly air-conditioned train car
A train carriage with weaker air conditioning, often preferred by passengers who find normal cooling too strong. Commonly seen on Japanese trains alongside 弱冷房車.
See also: 弱冷房車
The mildly air-conditioned car has gentler cooling, so it's recommended for people who feel the cold easily.
Compound of 弱 (じゃく, 'weak') + 冷 (れい, 'cooling') + 車 (しゃ, 'carriage'). A modern railway term.