A shameless young couple had sex, and yobs downed cans of lager and hurled abuse on a busy coach , witnesses say.
Families on board the National Express service say the sordid acts "ruined their holiday" and had kids in tears on Sunday.
Birmingham Live says a woman performed a sex act under a blanket near to the front of the coach while an "aggressive" group allegedly boarded with open beer cans before shouting and swearing.
The 387 service had not long left Blackpool, Lancashire, for Digbeth, Birmingham when the behaviour happened.
One mum, who did not want to be named, said: "I think Jeremy Kyle would be shocked with the behaviour of these people.
"On the national Express coach back from Blackpool last night, there were scumbags with open cans of beer let on board, having sex, anti social abusive behaviour, driver did nothing, young children on board, it was an absolute disgrace.
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"There was a young couple sitting near the front, the lady was performing a sex act under the blanket, the other large gang of people in 30s-40s who were allowed on board with beer cans in hand were loud, aggressive, swearing, shouting.
"My young children were intimidated by all the shouting and my one child was crying and said it had spoilt her holiday."
The coach firm thanked the passengers for raising the issue. It says the passengers in question have been banned from travelling with National Express in future.
A spokeswoman for the company said: "An alleged incident of anti-social behaviour on the 387 service travelling from Blackpool to Birmingham on Sunday 8th September was reported to both the driver and coach station staff on its arrival in Birmingham.
"National Express staff spoke with the passengers involved regarding the allegation and advised they would be refused any onward travel.
"Any incidents of anti-social behaviour are not acceptable and are dealt with accordingly. We would like to thank the fellow passengers for bringing this to our attention."
