I am old enough t remember waiting for the days when stores like Sears would send people the Summer, Winter, Christmas/Wish Book, and sales catalogs. I would make many purchases many items vis total "mail order", train and otherwise. Did this true mail order heart the "brick and mortar" stores?
To me, the net is the moder version of catalog and mail order.
And was it Lionel which stated a child who had electricity in the house anywhere could have a train in the house? If the child got the set via mail order, hwere was the hobby shop for support miles away from town?