How I get to Irrigation system from Dujiangyan railway station?

Upon arrival, you can take bus no.31 or 101a to the scenic area directly. Duration is about an hour.
I didn't see any train from Chongqing to Dujiangyan, so you'll make a transfer in Chengdu? If so, you can take the bullet train to Lidui Park Station, then walk for about 10 minutes to the irrigation sysyem scenic site.

Thank you very much for you help.
By the way, i found the train from chongqing north railway station to DJY station by this webside in the online train ticket schedule. I saw it easy if they have the CRH from chongqing.

I am sorry there is no train service from Chongqing to DJY on normal days. You are advised to make a transfer in Chengdu. Have a nice trip!
But you can take a tourist train to DJY. The trains are only avaiable on Friday, Saturday, and Sunday. :)

Thank you very very much. 😀😀😀