高铁可以改签提前。开车前48小时以上,可改签预售期内的其他列车;开车前48小时以内,可改签票面日期当日24:00前的其他列车,不能办理票面日期次日及以后的改签。根据我国相关法律的规定,旅客不能按票面指定的日期、车次乘车时,应当在票面指定的日期、车次开车前办理一次提前或推迟乘车签证手续,特殊情况经站长同意可在开车后2小时内办理。
法律依据
《铁路旅客运输规程》三十四条 旅客不能按票面指定的日期车次乘车时,在列车有能力的前提下可以办理一次提前或改晚乘车签证手续。办理改晚乘车签证手续最晚不超过开车后2小时,团体旅客必须在开车48小时以前办理。原票已托运行李的,在改签后的新票背面注明“原票已托运行李”字样并加盖站名戳。
动车组列车车票办理改晚乘车手续时,推迟乘车的时间应当在车站售票的预售期内。
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