You can sometimes get it to stop by trying to force alternate frame  rendering or split frame rendering on the game but most of the time  disabling multi-GPU mode is the only thing that helps.
		
		
	 
nhancer can do this for nvidia cards.
The real reason I'm unhappy is because it states on the back cover in recommended section at the bottom left: 
Vista/Windows7 (64 bit), 2gb ram
Core 2 Duo or equivalent,
nvidia Geforce 8800.
When a game manufacturer makes a statement such as these then I believe it is not unreasonable for me, the consumer, to believe that this game supports multi-threading and has 64 bit support.
This game does neither.
The way it plays indicates this most clearly.
If Toronto Rail Lands was on the game I doubt Speedtree alone would increase frame rates. 
In 9/10 games (make that 10/10) i have purchased in the last 5 years if it says Core 2 you see 2 active graphs in task manager.
Not in this game however! Nor is it capable of utilizing the benefits of 64 bit computing except on a very superficial level if at all.
In a game released in 2010 I would expect better performance, greater draw distance (unlimited), much more fluid in heavy asset environments,
DX10, multi threaded programing at the least.
Ideally physics and cuda (ATI equivalent) could be utilized. Then the programming would be more sophisticated. 
We're still in P4 Northwood 2004-5 phase.
Further, I would like to see in this game the removal of aliased control stands, interiors and engine sound in locomotives. 
In 1950's locomotives I don't want to see modern controls. 
I don't want to engage Dynamic/regenerative brake in a tram unless so equipped. I don't want to go fast in a tram.
I would like to see the radiator "wings" overhanging from inside the cab when running long hood 1st in the Chinese Locos.
If the loco is green on the outside then I'd like it to look green from the inside as well.
Is a GM EMD cab interior on a GE correct?..I don't think so. I think the Alco sound is just passible. The uneven beat of the unequal stroke length GE generator may be more appropriate however if so equipped.
I also dislike the aliasing of sound. 
The dynamic brake simulation is generally poor (they don't work like this, as in a real loco the generator is notched to 4 or 5 under no load to spin up the traction motor cooling fan because the traction motors get hot when generating power) 
The retardation occurs depending upon speed or whether extended range dynamic braking has been fitted and is in actual use ie. 2 settings normal/extended. I would like dynamic fan noise also.
If independent brake is applied whilst dynamics are in use instant wheel locking occurs resulting in flat spotted wheels on the prototype because of the double braking effect. This shouldn't be too difficult to simulate, surely. [the locking not the flat spots]
Super-elevation on concrete track would be a minimum.
Fix the problem when constructing layouts where the tunnels twist like a dying snake. This is really annoying. It takes planning to get them straight and that means too much time.
I could easily handle say only 2 or 3 closely prototypical Locomotives in the game, rather than 50 rubbish ones with 2 or three average ones. 
Again I hate aliased interiors and sound.
I would pay $50 for a new locomotive as an add-on as in FSX.For example: if you could have correct sound for engine type and the bloody thing looks the same from the inside as it does from the outside.
A minimum Standard for all rolling stock would be a bonus.
I note that in trainz 2010 some Bettendorf/Barber trucks have a nice prototypical ribbing detail on the axle side of the wheel face on some cars and others don't.
If we were to improve the game (read: simulation) then if it is fitted with one of the above bogies then that is the one that makes it to the game.
So you can't have different Bettendorf/Barber trucks ie. one higher detail and another lower detail in the game; there is just one.
This principal could then be applied to all bogie types. (standardizing, just like the prototype)
For me this game simulation is hardly an improvement over Trainz 2006, even if it is graphically better (particularly Port Ogden and Northern).
Many of my gripes were OK for TZ2006 but it is supposed to be evolving not re visiting the short comings of the previous incarnation.
Is this game a simulation or an arcade game? Neither i feel. It is trying to be all things to all people.