BORIS JOHNSON must reverse ticket office closures to stop nightmare travel chaos at some of Britain’s busiest stations, rail unions blasted yesterday.

Bottlenecks have built up regularly at London’s Victoria, Euston, King’s Cross and Liverpool Street mainline termini and station staff have been diverted to deal with queues at ticket machines.

The London mayor announced the closure of every ticket office on the London Underground in 2013 — despite pledging to keep them open when he stood for re-election the previous year.

Transport union TSSA general secretary Manuel Cortes fumed: “We warned against closing ticket offices.

“Tempers are fraying and people are being driven mad by long queues, which should be a cause for national embarrassment.”

Rail union RMT general secretary Mick Cash added: “The cuts must stop.

“London’s Tube system is constantly facing dangerous and chaotic overcrowding as passenger numbers surge against a backdrop of under-investment and attacks on staffing levels.”

Tube chief operating officer Steve Griffiths insisted that “customer satisfaction is at an all-time high” and that ticket sales were “quicker than ever before.”

But Labour’s Val Shawcross hit back, saying Tories’ insistence that the capital could cope without ticket offices had “well and truly been rubbished.”

“By combining station staff cuts and ticket office closures Boris Johnson has left fewer staff available at stations to help passengers,” she said.

“The mayor needs to recognise the impact his closures are having and urgently review where additional ticket machines and staff need to be added to help ease the strain.”