Interpretation for start-end station of OpenRoad corridor

Hi

I am working on a project (written in C#) that export OpenRoad model to other format. 

I am getting the corridor from Bentley.CifNET.GeometryModel.SDK.Corridor, this corridor has start station at 374 and end station at 1865.

This corridor is attached to the alignment which has length 653 and its start station is 3048 and no station equation is defined.

It looks strange for me that the end station of corridor is over the alignment.

Could anyone explain me about the meaning of start-end station of corridor or direct me to the document/resources?

I'm using ORD & SDK version 10.09.00.91

Thank you

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