Some people, including at least one of Amtrak’s original board members, believed that Amtrak’s proper role was to phase out passenger trains. That goal was aborted when by the 1970s energy crises, thus giving Amtrak an apparent reason for existence: saving energy.
This card encourages people to ride the train and thus save themselves the cost of gasoline. The card is undated, but based on the sample fares on the back I estimate it was issued in 1975. Most of these fares are slightly less than the fares shown in Amtrak’s 1976 timetable that I’ll post here in a couple of days.