The firm said it was due to high staff shortages and encouraged commuters to travel on Friday or Sunday instead, or claim a refund.
Image source,Avanti said the delay had been caused by having to produce bespoke timetables - in partnership with Network Rail - during engineering work.
The operator, which runs trains to Birmingham, north Wales, Liverpool, Manchester and Edinburgh, has also beenOn Monday it emerged Avanti had cancelled about a fifth of services in the four weeks to 7 January. The company, which is a joint venture between FirstGroup and Italian state operator Trenitalia, said performance had "steadily improved" since then.
The Office of Rail and Road regulator said the firm had been ordered to submit an improved recovery plan by 2 February for producing timetables and releasing tickets or face "formal measures".
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