支付宝可以运用第三方服务列表里的火车票机票功能购买火车票。
支付宝购买火车票步骤：
1、打开支付宝主页面，点击进入火车票机票。如果主页面上没有火车票机票选项，点击更多，下拉页面到第三方服务，点击进入火车票机票预订页面。
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2、在火车票预订页面，输入对应的出发地、到达地、出发时间，点击开始搜索。
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3、选择车次，点击进入车次详情页面。
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4、选择座位类型，点击立即预订。
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5、确认登录12306账号，添加/修改乘车人，乘车人姓名和身份证信息即出现在下方，输入接收确认短信的手机号，在线选择座位，点击立即预订。
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6、确认车次、座位信息，点击去付款，依据提示完成付款操作，即可在支付宝成功购买火车票。
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