I.M. Foreman's One-Species Nongenetically Engineered Travelling Show was a complex space-time event. It was similar to, although not like, a TARDIS.
Piloting and travel Edit
It was a space-time vessel but it had no extra-dimensional connections. It moved through space and time by retroactively building a site and disguising itself before/during/as it moved there. This process took years.
It was not designed for instantaneous (or even fast) travel, unlike a TARDIS. Unlike most TARDISes, the show could (and did) travel back into the Dark Time. (PROSE: Interference - Book One, Interference - Book Two)
Effects the show had on space time Edit
A by-product of this was that it sometimes knocked dents in space-time, luring other space-time travellers to the site. It brought Faction Paradox, the Remote and the Third Doctor and Sarah Jane Smith to the planet Dust. The Third Doctor implies that it may have brought his first incarnation and Susan to Earth, 76 Totter's Lane, 1963. (PROSE: Interference - Book One, Interference - Book Two)