XML Reports Difference Between Station Base Reports and Station Offset Reports

Hi all

I am currently using Bentley Rail Track and i am carrying out some XML reports, however I was wondering if someone could explain ideally with a simple example the difference between Station Base Reports and Station Offset Reports???

Also i am trying to create a report which produces the exisiting 6ft interval between two 6ft rail can someone explain how i can achieve this and which & why of the above 2 reports (Station Base or Station Offse) should be used.

Can anyone recommend any training / usermanuls for Bentley Rail Track?

Thanks