Rails - Apr 2006 - Table w/ 2 columns feat. the same foreign key (accessing?)

I have a database table named trips which has two columns (in addition 
to others) which both have foreign keys to the locations table. The 
columns are for a start location and an end location. The problem arises 
in the trip model in trying to access each location.

belongs_to :location, :foreign_key => ''start_location_id''
gives me
access to one of the locations but how can I access the other?

Thanks

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