Bonding over a mutual love of classic prog bands like Genesis and Van der Graaf Generator, the two began writing and recording together, forming a musical partnership that would continue for decades. The early '90s saw Big Big Train emerge from a nascent duo to a full-fledged band featuring Spawton on guitar and Poole on bass, with new members Martin Read on vocals, Steve Hughes on drums, and Ian Cooper on keyboards. A pair of self-released demo albums got them signed to European label Giant Electric Pea, which released their debut full-length, 1994's Goodbye to the Age of Steam. Their intelligent, melodic prog was well-received and yielded a licensing deal in Japan in 1995. That same year, keyboardist Cooper was replaced by new recruit Tony Müller, resulting in the first of what would eventually be numerous lineup shifts over the coming years. A London show, where they debuted material from their upcoming second album, would prove to be their only live performance during this period and, following the release of 1997's English Boy Wonders, it seemed Big Big Train's momentum had already faded.

Over the next few years, Spawton and Poole retreated to their studio, slowly writing and recording the material that would become 2002's Bard. The lineup continued to shift, with the core duo remaining the band's creative center. Their next release, a 2004 conceptual album called Gathering Speed, was dedicated to the airmen and women who perished in the Battle of Britain. It was seen as a return to more traditional prog rock and was the first to feature new vocalist Sean Filkins. 2007's The Difference Machine was a similarly detailed, deeply progressive album that hosted several guest musicians who would eventually join the band full-time. At this point in their career, Big Big Train had established themselves as a veteran and respected presence among other second- and third-wave prog bands like Marillion and Spock's Beard, the latter of whom provided their next drummer, Nick D'Virgilio. With a new vocalist in David Longdon, they recorded their sixth album, The Underfall Yard (2009), an exploratory work that played nostalgically on historical themes and featured guest spots from former XTC guitarist Dave Gregory, among others. A long EP called Far Skies Deep Time arrived the following year and featured Gregory, as well as members of French pop auteur Louis Phillipe's band. With a 17-minute epic saga about Belgian pop star Jacques Brel's last voyage, it played up Big Big Train's distinctive melding of thoughtful British pop and classical, progressive themes.

2011 saw a deluxe remix and remaster of the band's debut, Goodbye to the Age of Steam. Their seventh and eighth albums would roll out as a two-part set called English Electric, Pt. 1 (2012) and Pt. 2 (2013). The two albums garnered critical acclaim, ironically earning the veteran band the Breakthrough Act award at the 2013 Progressive Music Awards. By this point, Big Big Train had been operating as a studio project for well over a decade, but 2015 would see not only a new EP (Wassail), but their first live performance in 17 years. With a lineup that included Dave Gregory (now a full-time member), new violinist Rachel Hall, Beardfish frontman Rikard Sjöblom, and a five-piece brass ensemble, Big Big Train sold out a three-night stand at King's Place in London in August 2015. Their ninth studio album, Folklore, arrived in May of the following year. ~ Timothy Monger