Amid chaotic scenes at Keleti station in Budapest a thousand, mainly Syrian nationals, have set off for Vienna on foot.
Earlier right-wing extremists hurled fireworks into the crowd that had been camped at the station for days, sparking an angry response.
The migrants are desperate to reach Germany.
As Europe witnesses people movement reminiscent of the Second World War locals offered food and water to those heading for Austria.
EU states have been unable to come up with a coherent response to the crisis.
At Bicske station outside the capital the two-day stand-off between migrants on board the so-called ‘freedom train’ continues as passengers refuse to disembark to be processed at a refugee centre.
As chaos marked the day hundreds of people escaped a camp at Roszke close to the Serbian border and are being pursued by the authorities.
Police are attempting corral the rest using pepper spray.
One person is reported to have died in the confrontation.
Tensions are at boiling point.