Let's see if I can give you a "non-spec" answer to your plight.
In my opinion....... There are only a few laptops that will run Railworks satisfactorily. That makes your query a lot simpler; there are only 3 or 4 or 5 brands to look at. Within those brands, you will ONLY want to look at laptops that are specifically designed for gaming. These are the only ones that will have the graphics capabilities needed to make RW really run nice. Once you are in that category of each vendor, you will only have 1-4 models from each and then it simply comes down to money. How much do you want to spend?
To make a complete assumption here (based on my 18 years of recommending pc purchases to consumers and corporate clients)......... the average gamer will be satisfied with the average performance of the average gaming laptop..... I mean the "middle-of-the-road" model. Check yourself... what are your usual expectations in your other computer usage.... do you demand perfection? Do you spend hours trying to get your home/work computer to run perfectly? Or, do you mind if you see most of the graphics in medium quality mode, at medium speed, with tiny hiccups and millisecond stutters every 10-15 seconds (really, that is "average" for RW, and perfectly acceptable by many) but doesn't have any effect on your productivity or satisfaction? Last thought... how much time are you going to spend with it? An hour a day? Don't spend a fortune. Three hours/day? Your eyes will thank you to spend a little extra.
The gaming laptop is an emerging product category; it is very competitive and each vendor is constantly updating the technology they put into it. That is both good and bad.... the newest, "bleeding edge" technology can give you nightmares as an owner. Since you've by now narrowed your choices down to a handful of units, go to the public opinion websites/forums and read up on each of those models. What are the other owners saying and how long have they had their systems? What problems did they have and are those problems ones that would drive you bonkers (every computer has some kind of problem! lol)? Go with the model that seems the most "stable" and makes the most users happy.
As long as you stay in this category of honest-to-goodness gaming laptops, you don't need to worry about the exact parts in the guts; the manufacturers are worrying about that for you. Last choice.... how much $$$ is the right amount of $$$. There are good gaming laptops available for $1,000. You might find a fair one for $600 and up. And there are great ones that run $1500 to $1900. I love mine and it cost a lot, but then I spend 8 hours a day developing on it. Don't overspend.
There is a thread going on another site on this very topic that will give you some brand names to begin with. Try the links in this thread....
http://www.trainsim.com/vbts/showthread ... ise-pleaseAlso, Dell makes a line of gaming laptops. I've always recommended Dell over others until the last couple of years. While the dependability is still good, their systems were showing lower quality while their prices are going higher the last time I compared them last summer.
Tori