I don't understand why dining car service can't be evaluated like any other product Amtrak offers. If it turns an operating profit by itself, great, keep it. If reducing dining car costs cutting back on service or scrapping it altogether has a disproportionate impact on ticket review (e.g. for every $1 of food service expense cut, ticket revenue drops by $2, say), then keep it as is. If raising prices brings it into the black, raise away. But if it's a money loser, can't be fixed and it doesn't have a meaningful impact on ticket revenue, cut it, scrap it or contract it out and take it off the books.