HAPPY PARTY TRAIN

HAPPY PARTY TRAIN is Aqours's third single. It was released on April 5, 2017 on both CD and DVD/Blu-ray disc.

The tagline for the single is "新しいみんなで叶える物語" (A story that will come true with a new everyone)

The song is written by Aki Hata, composed by Takuya Watanabe and arranged by EFFY.

CD

 * 1) HAPPY PARTY TRAIN
 * 2) SKY JOURNEY
 * 3) Shoujo Ijou no Koi ga Shitai (少女以上の恋がしたい)
 * 4) HAPPY PARTY TRAIN (Off Vocal)
 * 5) Danketsu! Watashitachi no Sabaibaru (団結！私たちのサバイバル)
 * 6) Kaiki! Mayonaka no Misuterii (怪奇！真夜中のミステリー)
 * 7) Kiseki! Mirai e no Torejaa (奇跡！未来へのトレジャー)

DVD/Blu-ray

 * 1) HAPPY PARTY TRAIN (Animation PV) (HAPPY PARTY TRAIN(アニメPV))

High-Resolution

 * 1) HAPPY PARTY TRAIN
 * 2) SKY JOURNEY
 * 3) Shoujo Ijou no Koi ga Shitai (少女以上の恋がしたい)
 * 4) HAPPY PARTY TRAIN (Off Vocal)
 * 5) SKY JOURNEY (Off Vocal)
 * 6) Shoujo Ijou no Koi ga Shitai (少女以上の恋がしたい) (Off Vocal)

Audio

 * Does not work on iPad, or any medium that does not support the .ogg audio format.

Live Performances

 * Aqours 2nd Love Live! HAPPY PARTY TRAIN TOUR
 * Nagoya: August 5 & 6, 2017
 * Kobe: August 19 & 20, 2017
 * Saitama: September 29 & 30, 2017
 * August 25, 2017: Animelo Summer Live 2017 -THE CARD-
 * October 21, 2017: Mezamashi TV PRESENTS T-SPOOK ~TOKYO HALLOWEEN PARTY~
 * Aqours CLUB LIVE & FAN MEETING -Landing action Yeah!!-
 * Osaka: November 4 & 5, 2017
 * Sapporo: December 10, 2017
 * Fukuoka: January 6, 2018
 * Nagoya: February 3, 2018
 * Aqours CLUB LIVE & FAN MEETING Trip to Asia -Landing action Yeah!!-
 * Seoul: November 18, 2017
 * Shanghai: January 20, 2018
 * Taipei: February 10, 2018
 * November 25, 2017: NHK WORLD presents SONGS OF TOKYO
 * December 27, 2017: Sakazaki Kounosuke no Momoiro Folk Mura NEXT
 * January 8, 2018: DENGEKI MUSIC LIVE!! 2018
 * Aqours 3rd LoveLive! Tour ～WONDERFUL STORIES～
 * Fukuoka: July 7 & 8, 2018
 * November 18, 2018: Aqours 4th LoveLive! ～Sailing to the Sunshine～
 * June 9, 2019: Aqours 5th LoveLive! ～Next SPARKLING!!～
 * July 6, 2019:  Aqours World LoveLive! in LA ～BRAND NEW WAVE～
 * January 19, 2020: Love Live! Fest
 * December 31, 2020: Aqours ONLINE LoveLive! ~WHITE ISLAND~

Trivia

 * Standees of the HAPPY PARTY TRAIN art placed at AnimeJapan 2017 were stamped with both the Love Live! Sunshine!! and Izu-Hakone Railway Group logos, implying some form of collaboration either behind or based on this single's theme
 * The single sold 23854 copies on the first day.
 * The order in which the members of Aqours sing their respective solo parts in this song matches the order they placed in the poll to determine the song's center.
 * Specifically: Kanan, Yoshiko, Hanamaru, Riko, You, Chika, Dia, Mari, Ruby

PV-based

 * The dancing stage in the PV is based on Bunngomori Rail Yard, established in 1934. It is recorded as part of the Heritage of Industrial Modernization by Japan . The rail yard is now a museum and hosts a JNR Class 9600 steam locomotive in the fashion shown in the PV , but the PV chose a JNR Class C58 instead to base the "Happy Party Train" on.
 * The various scenes are based on Izuhakone Railway Sunzu Line . More specifically, Mishima Station and Izu-Nagaoka Station made appearances.
 * Mishima Station is at one end of the Sunzu line which connects to the shinkansen bullet trains, while Izu-Nagaoka Station is the station closest to Uchiura where the girls reside.
 * The PV marks the first animated appearance of Ruby's younger self.