What laptop is best for games?

You'll have to try this the other way around. Give the forum say 2 or 3 of your final picks and let members give a nod to one or another.

I've yet to find a best model laptop for that price. A little too low IMO.

Seems Train Simulator 2016 does not need too high-end GPU, here is the website for your reference.
http://www.game-debate.com/games/index.php?g_id=23373&canMyGpuRunIt=Train%20Simulator%202016

My personal preference is to follow the main stream of the technology, say CPU and GPU spec here. So, GTX950M may be my lowest requirement to consider, and I might add up to one higher price level and wish for more stable and better performance. To be honest, you may play more power/CPU/GPU consuming games in the future, so maybe do not let the hardware become your limit?

In the link below, MSI and Dell will drag my attention in this case:
http://www.amazon.com/gp/search/ref=sr_nr_p_36_3?rnid=2421885011&keywords=gaming+laptop&rh=n%3A172282%2Cn%3A541966%2Cn%3A13896617011%2Cn%3A565108%2Cn%3A13896615011%2Ck%3Agaming+laptop%2Cp_6%3AATVPDKIKX0DER%2Cp_n_feature_seven_browse-bin%3A3012497011%2Cp_n_operating_system_browse-bin%3A12035945011&qid=1460151877&low-price=700&high-price=900&x=14&y=8

for gaming its the pc with the biggest ram and processor - at the end of the day its about speed

Yes, I agree with that if you just want to have some entertainment, such as playing Train Simulator 2016, it doesn’t need really high-end laptop. Yet, there are two points, first of all, sometimes the recommended requirements of laptops have not always enough for the game as we’ve used the laptop for a period of time. Therefore I suggest you could get a laptop above the recommended requirements which at least loaded with 8G Ram, GTX950 and core i5. Furthermore, it’s really hard to say that you may play other games in the near future; if in this case, why just choose a laptop (if affordable) that you could comfortably play on without any upgraded issues. Also I think in the below you can fine some great gaming machines.

http://www.amazon.com/gp/search/ref=sr_nr_p_36_3?rnid=2421885011&keywords=gaming+laptop&rh=n%3A172282%2Cn%3A541966%2Cn%3A13896617011%2Cn%3A565108%2Cn%3A13896615011%2Ck%3Agaming+laptop%2Cp_6%3AATVPDKIKX0DER%2Cp_n_feature_seven_browse-bin%3A3012497011%2Cp_n_operating_system_browse-bin%3A12035945011&qid=1460151877&low-price=700&high-price=900&x=14&y=8

when I saw "the bigger the better" from lovespellsxp's post, I thought of 18" gaming laptops. Although it's beyond your budget, there are MSI GT80 and Alienware 18. Just saying..it felt really great to game with a bigger screen...maybe try that out in some available retail stores.