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Engineer, yes. after a few years of saving and smart spending. You cannot have a GTR AND a large house at the same time.

Train conductor? Ihave no idea what their salaries are.

By train conductor or engineer I'm assuming you mean train conductor or train engineer. Yes, you can make enough. But you'll really have to skimp out on other things like a home. I think train conductors make 65K a year or something. Which leaves about 5.4K per month. The rule of thumb is no more than 20% of a month's salary on cars so that leaves you with a little of 1K. A GTR costs around 90K and finance rates aren't favorable. So you'll be looking at paying 1.5K per month if you got 0% 60 months finance rate (which is the best and not likely).

If you want this car you'll have to live with a much smaller home, less luxuries, like cable TV maybe, it'll be difficult for you to support a family of 4. Not to mention the car will depreciate in value

Buying this car is not a smart investment if you can't afford it comfortably.

The only way I see you buying this car is saving $250 a month and buying it when you retire.

I suppose anything is possible, but if you work on a train, you won't be home to drive your "dream car".