c# - Benefit of wrapping List into class TList

The company I work for has been doing some arguably odd things in their source code.

One of these things I can't wrap my head around (no pun intended) is the benefit of wrapping a List in a class TList.

Example

public class ThingModel
{
    //model properties
    public string Name { get; set; }
}

public class ThingModelList : List
{
    //this is just an empty wrapper, no code is in here in our source

}

in the methods that use a list of ThingModel you would do
ThingModelList = new ThingModelList(); rather than List = new List();

I don't see the benefit of doing this, and it's confused me multiple times (especially with longer names). Maybe someone could give me some insight into the benefits?