SIDRAT

A SIDRAT (pronouced "sigh-drat", not "sid-rat") was a type of space-time vehicle used by the War Lords with the assistance of the War Chief.

Similar to a TARDIS, the SIDRATs were somewhat less-evolved time/space travelling machines. From the outside they resembled featureless rectangle boxes. The War Lords employed them both to abduct Human soldiers to the war games and also conduct the War Lords from the game area to their base. (DW: The War Games)

According to one source, the name may have been an acronym for "Space and Inter-Dimensional Robot All-purpose Transporter" (DWN: Doctor Who and the War Games). It is also TARDIS backwards.