A list of multiple data types?

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The easiest way to do this is to declare an interface, and have both types implement it:

public interface IMachine { … }

public class MachineLine : IMachine
{
    public double X1;
    public double Y1;
    public double X2;
    public double Y2;
    public double Thickness;
}

public class MachineCircle : IMachine
{
    public double CenterX;
    public double CenterY;
    public double Radius;
}

Then you can do this:

List<IMachine> m = new List<IMachine>();

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