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The minivan service at Thanaleng Railway Station is one of the few, if not only way to get from the secluded railway station to Vientiane city centre, about 22 kilometers away.
While the immigration queues are ongoing, the local staff at Thanaleng Railway Station for the minivan service to Vientiane set up their counter just beside the immigration counters. If you have not gotten the combined train+minivan ticket at Nong Khai for 300 Baht (~$12.53), you can purchase the minivan-only ticket here at Thanaleng for 200 Baht (~$8.36) instead, which actually makes for a cheaper option for the same service (ie. 20 Baht for the train + 200 Baht for the minivan = 220 Baht in total).