You'll notice a number of these advantages involve time. It is a precious commodity on any trip. Business travelers thrive or fall on efficiency. Vacationers usually have fewer days than they would like, and want to make the most of their limited opportunities.

Overnights on a train are not always restful--often quite the opposite. But a bed (or seat) on a train is almost always cheaper than the same amount of padding in a motel. You wouldn't want to do it every night, but a few carefully selected train overnights will help your budget.

Consider the discounts offered with a BritRail or Eurail pass. You pay one price for unlimited mileage within your desired area of travel. There are "companion" fares that can save 40% or more over a conventional ticket.

At times, Amtrak offers some incredible promotional fares and passes, too. Check their Web site for current offers. Passes are available on U.S. and Canadian lines, too.

You must decide if those (or any) passes save significant money or time over a conventional ticket. The point is to make the comparison. Try it!

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