 was seen by 4.78 million viewers when it was broadcast on BBC2 on 20 March 1992.BBC Two repeated "Thunderbirds" in 2000, a year known for several major rail accidents in the UK (notably the Hatfield rail crash; others occurred in Tisbury, Wiltshire and Hither Green, London).Consequently, it was decided to postpone the transmissions of the episodes "The Perils of Penelope" and "Brink of Disaster" (both of which feature train disasters) until the end of the run.