"Seems it happens all the time. Took the Muggles an hour and a half to realise the train had vanished into thin air."
-- Ministry of Magic source (DP2)
As part of a bet, Cornelius Fudge’s nephew causes a Muggle “tube train” to disappear. Muggle travellers wait an hour and a half for their train before figuring out that it has vanished. As results of the event, Rufus is suspended from his job at the Improper Use of Magic Office and the public questions the Ministry’s purported commitment to eradicating anti-Muggle bias within its ranks (DP2).
While the date printed on DP2 is 8 February 1999, the timeframe for these events is 1992-1993.