Simplify the following text for a Grade 8 native English-speaking person.
Original: Rolling stock is also allocated an RA ( again between 1 and 10 ) and the RA of a train is the highest RA of any of its elements .
Simplified: Rolling stock is also given an RA ( again between 1 and 10 ) and the RA of a train is the highest RA of any of the supporting elements .