The so-called Yellow EP was an untitled 12" Gang of Four

Gang of Four (band)

Gang of Four are an English post-punk group from Leeds. Original personnel were singer Jon King, guitarist Andy Gill, bass guitarist Dave Allen and drummer Hugo Burnham. They were fully active from 1977 to 1984, and then re-emerged twice in the 1990s with King and Gill...

 EP

Extended play

An EP is a musical recording which contains more music than a single, but is too short to qualify as a full album or LP. The term EP originally referred only to specific types of vinyl records other than 78 rpm standard play records and LP records, but it is now applied to mid-length Compact...

 released in 1980 by Warner Bros.

Warner Bros.

Warner Bros. Entertainment, Inc., also known as Warner Bros. Pictures or simply Warner Bros. , is an American producer of film and television entertainment.One of the major film studios, it is a subsidiary of Time Warner, with its headquarters in Burbank,...

 in the US, consisting of songs issued as singles by EMI Records in The UK. It came to be known as the Yellow EP because of its sleeve color. All four songs were later included on Infinite Zero Archive/American Recordings's 1995 CD

Compact Disc

The Compact Disc is an optical disc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage , write-once audio and data storage , rewritable media , Video Compact Discs , Super Video Compact Discs ,...

 issue of Entertainment!.

Side one

1. "Outside the Trains Don't Run on Time" – 3:13 (recorded March 1980. A re-recorded version later appeared on Solid Gold
   Solid Gold (album)
   Solid Gold is the second album by the British post-punk band Gang of Four, released in 1981. Two of its tracks, "Outside the Trains Don't Run on Time" and "He'd Send in the Army", are re-recordings of songs previously released as a single in the UK....
   
   in 1981)
2. "He'd Send in the Army" – 3:39 (recorded March 1980. A re-recorded version later appeared on Solid Gold)

Side two

1. "It's Her Factory" – 3:07 (recorded March 1979. Originally released as the B-side of the "At Home He's a Tourist" single)
2. "Armalite Rifle
   ArmaLite
   ArmaLite is the name of a small arms engineering facility founded in the early 1950s, and once associated with the Fairchild Engine and Airplane Corporation. ArmaLite was formally incorporated as a subdivision of Fairchild on October 1, 1954...
   
   " – 2:48 (recorded June 1979. An earlier version was released in December 1978 as B-side to Gang of Four's 1st single, Damaged Goods, recorded for Fast Product Records)

Personnel

• Dave Allen
  Dave Allen (producer/bassist)
  Dave Allen was the bass guitarist for the post-punk band, Gang of Four. In 1981, he left Gang of Four to found Shriekback....
  
   - bass guitar
  Bass guitar
  The bass guitar is a stringed instrument played primarily with the fingers or thumb , or by using a pick....
  
  , vocals
  Singing
  Singing is the act of producing musical sounds with the voice, and augments regular speech by the use of both tonality and rhythm. One who sings is called a singer or vocalist. Singers perform music known as songs that can be sung either with or without accompaniment by musical instruments...
  
  
• Hugo Burnham
  Hugo Burnham
  Hugo Burnham was the drummer for the English rock group Gang of Four. Creem magazine's Dave DiMartino said in 1980 "Witness Hugo Burnham, a close-cropped, thickset out-and-out scary drummer who looks like his idea of fun might be pushing young American faces into old American brick walls." He...
  
   - drums
  Drum kit
  A drum kit is a collection of drums, cymbals and often other percussion instruments, such as cowbells, wood blocks, triangles, chimes, or tambourines, arranged for convenient playing by a single person ....
  
  , vocals
• Andy Gill
  Andy Gill
  Andy Gill is a founding member and guitarist for the English rock group Gang of Four, considered among the most influential post-punk bands...
  
   - guitar
  Guitar
  The guitar is a plucked string instrument, usually played with fingers or a pick. The guitar consists of a body with a rigid neck to which the strings, generally six in number, are attached. Guitars are traditionally constructed of various woods and strung with animal gut or, more recently, with...
  
  , vocals
• Jon King
  Jon King (musician)
  Jon King, born 8 June 1955, London, is a singer, musician and founding member of the Leeds based UK rock band Gang of Four. He attended Sevenoaks School, where he was a member of the 'Art Room' that produced musicians Tom Greenhalgh and Mark White of The Mekons, along with Andy Gill of Gang of...
  
  - vocals