Thanks for your help.  4 of the cars match exactly xcept the baggage car.  I will just keep the set together as my biggest fear is putting the wrong train in the wrong box.  That would be a disaster.

my husband passed away and I am organizing the train collection. I need help identifying the following set.
it is made by  williams trains it has 4 sante fe cars abd in that says "railway express agency 2540" on it.
Is there a name for this set?   or some number,.   thanks for any input.