Why is my list showing the last added item

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C#

I have a bit of challenge which I have tried to google and find similar problems. I have tried some of the solutions but still unable to get it solve so I decided to open a new thread.
The issue now is if I try to print out the items inside pain.transaction, I get one only items for multiple records which isn't supposed to be so. How do I go round this? I can't also change how I read the xml file. I have to stick to this approach.

What I have tried:

    List<Transactions> tl = new List<Transactions>(); 
    Transactions t = new Transactions();
    XmlNodeList details = xmldoc.GetElementsByTagName("Dtl");
    foreach (XmlNode crdNode in details)
    {
        XmlNode CdtName = crdNode["Nm"];

        t.Name= Name.ChildNodes.Item(0).InnerText;
        //If i print out t.Name, it displays all the names.

        XmlNode CdtAddress = crdNode["PstlAdr"];

        t.Address=CdtAddress.ChildNodes.Item(0).InnerText;

    }
    XmlNodeList pmtId = xmldoc.GetElementsByTagName("ID");
    foreach (XmlNode Pm in pmtId)
    {
        XmlNode transaction = Pm["Ref"];
        t.TransactionReference =transaction.ChildNodes.Item(0).InnerText;
    }
    XmlNode instruct = Pm["Instr"];
    t.Instruction =instruct.ChildNodes.Item(0).InnerText;
}
tl.Add(t);
pain.transaction = tl; //pain.transaction contains a list of transaction