I echo byte's concern regarding ads making the operation look tacky, but I really don't think it's going to hurt Amtrak by advertising an automobile.
Lots of people who ride the train already have a car of some sort. Many don't, but often it's because of a lack of financial means, or lack of driving ability. True, there are some (such as myself) who could own a vehicle, but choose not to, but I don't think one ad on the side of a locomotive is really going to change their mind, especially if all the advertising in newspapers, magazines, other billboards, and on the telescreen weren't effective.
It *might* sway someone thinking of buying a new vehicle towards that particular brand, but I don't think Amtrak will lose any ticket revenue.
That said, I'd rather Amtrak put its own advertising on its cars/locomotives. They have a few baggage cars painted up in Vermonter and Adirondack schemes, even though the cars are just as likely to be found traveling the Coast Starlight as anything else (and one or both of those trains may not even offer checked baggage anymore).
A good route map, 1-800-USA-RAIL, and
www.amtrak.com on the side of an engine or baggage car could possibly get someone investigating into the possibility of taking a trip. The fact is, very few people "out here" know where Amtrak goes, or when it runs, or anything else for that matter. Simply putting something like that in front of them for the couple of seconds that they may see it might actually make an impression on them.
It is absolutely essential that this practice not spread to passenger-occupied cars. A few years ago, Amtrak teamed up with Yahoo and Compaq to offer wireless internet service on a few trains through Compaq handheld computers provided on board (the service was offered on one NEC train, one Hiawatha, and one California train). To advertise the service, they wrapped a coach with the Yahoo logo. I rode in that car once (and the representative for the computer company was off sick that day, so we weren't able to test the service), and, just as in transit buses, the wrapping made it impossible to see out the windows. It may not be as big of a deal for a local bus where you'll be on for 20 minutes, but if it's a car that people will be on for several hours (or more), keep the windows clear.
Robert Madison