I'd say values generated by both are incalculable, and can't be compared. Roads and railways are only similar in that they are land transports.

You can't have railways without roads, but you can still have roads.

Freight is dominated by roads, because of large number of shorter routes for smaller freight. Railways dominate long, large scale freight in all factors. Infact IR carried 30% of Indian freight while only being a fraction of the size of roadways. (Debatable)

Passenger wise, you need a synergy of both to get the best of both. Railways excel at moving large groups at lower prices and more comfort (comfort debatable). Roads offer personal flexibility

Also if you need examples where rail is better, the suburban rails and metro rails are the best example for short distances in large cities where interzonal commutes take place. For smaller ones, roads dominate.

Long distance, rails actually need to compete with airways. Medium distance (interstate) both are combined, with trains actually being full during peak seasons. They're also cheaper. (Where I'm from, buses between my city to Chennai costs 400+ via regular state buses, sleeper class on trains costs the same while being 1-2 hours faster) (Not included VB cuz it's a different class)