what tracks can i buy to expand this set? all of the sets seem to say "not to use with lego 9v trains" - is this set a "9v" train?

The confusion about 9V vs. RC is easily cleared-up: 9V tracks were discontinued by LEGO in 2007 as they were proving increasingly expensive (they were metal and electrified, transmitting power to the train's 9V motor). Beginning in 2006 and continuing to the present LEGO has produced all-plastic tracks (no power runs through the tracks themselves) for trains that contain a power function (motor) within the train itself and are operated via a remote control ; thus the tracks are referred to as RC tracks. RC tracks allow for use of multiple trains running and various speeds as each train can be individually controlled (not so with 9V). All LEGO trains since 207 have RC tracks. Unless you are buying a vintage, retired LEGO train set from pre-2008 you needn't concern yourself with 9V. A simple way to think of the difference: 9V trains are like mono-rails (such as in Miami) powered by the electrical tracks themselves...whereas RC tracks are like real trains, where the power is in the locomotive itself and the tracks are simply the "road" the train runs on. Wikipedia article: http://en.wikipedia.org/wiki/Lego_Trains

What is the radius of curvature of the curved sections of track? (Or diameter of a complete circle?)

Each curve is 22.5 degrees. The radius is 12.5in from the center of the track to the center of the circle.

what kind of batteries dose it take

You need 6 AAAs for the train and 3 AAAs for the controller. Verify this by going to LEGO and looking up the power functions parts 88000 battery box. and 8879 IR remote. They do sell a LIPO battery but it is overpriced as all the charging electronics are contained in the battery.

Can anyone share the distance of the remote control? I have a setup that would require six feet - will this reach?

Under normal conditions reaching distance will exceed 10 meters or roughly 33 feet. Bright sunlight, low batteries in the IR Remote Control, or blocking of the line of sight may also decrease reaching distance. An average estimate is 10-15 feet.

Number of Pieces	888
Item Weight	2 Kilograms
Item Dimensions	22.91 x 14.88 x 4.65 inches
Style Name	Modern
Item Shape	Rectangular Prism
Occasion Type	recreational
Collection Name	TOY_VEHICLE_SET" or "Train Set
Color	Multicolor
Theme	Animal
Frame Material	Plastic
Base	Plastic
Outer Material	Plastic
Material Type	Plastic
Required Assembly	No
CPSIA Cautionary Statement	Choking Hazard - Small Parts, No Warning Applicable
Assembly Time	10 Hours
Not for Kids	No
Number of Batteries	9 AAA batteries required.
Compatibility Options	LEGO construction sets
Includes Rechargeable Battery	No
Rail Gauge	Standard Gauge (approximately 1,435 mm or 4 feet 8.5 inches)
Control Type	Infrared Remote Control
Fit Type	circular
Number of Players	1
Controller Type	Infrared
Control Method	Remote
Special Features	Construction, Vehicles
Includes Remote?	No
Remote Control Technology	Infrared
Skill Level	Low
Is Electric	No
Power Source	Battery Powered
Battery Type	This product uses batteries for power.
Educational Objective	Creative Thinking

LEGO City Cargo Train 60052 Train Toy

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