You may well be surprised at how well your models photograph. Good Lighting A poorly lit picture of the best model railroad just isn't gonna look very good. If you can get the railroad outdoors by all means do so. The daylight films tend to be finer grained than the tungsten balanced films and daylight just looks more natural. But if you can't get outdoors determine what kind of lighting you want to simulate.
Real sunlight casts pretty sharp shadows, but each object only casts one shadow.
So unless you've carefully eliminated multiple shadows on your layout don't shoot under layout lighting. Don't make the mistake of taking pictures using fluorescent and incandescent lighting in combination - the places where the flurescent light is shadowed will be reddish while the places where the incandescent light is shadowed will be greenish blue. This is nearly impossible to correct with a computer let alone with conventional photo methods. While it is possible to buy filters that will balance daylight film for either fluorescent or incandescent lighting they will increase your already long exposures by a factor of about 4. It's better to just use tungsten balanced slide film.