noun
blue train; sleeper train
Abbreviation of ブルートレイン. Refers to a long-distance sleeper train, especially the classic blue-painted ones in Japan. Casual, commonly used in conversation and media.
昔はブルトレで旅行するのが憧れだった。
In the old days, traveling by blue train was something people dreamed of.
ブルトレの寝台券はすぐに売り切れる。
Sleeper tickets for the blue train sell out quickly.