I have a table that is 10 ft by 3 ft, and have to make and oval. Is it possible to make this work with curve? Or, will the curve be too tight for the engine to make the curve ? thank you !!!

The flex track will make this curve, but as you suggest it may be too tight for some locos and rolling stock. Fitting it in 3' will result in a radius of less than 18", which is less than is recommended for most HO Scale rolling stock. A small loco and short cars may be able to negotiate this, but trying it out is the only way to know what will work for sure.

How long is each piece of track

These are 3' (36") long sections.

Atlas - Code 100 Super-Flex Track - HO (1)

Name: Atlas Code 100 Super-Flex Track - HO (1)
Brand: Atlas
SKU: 150-168
Price: 4.9 USD
Availability: InStock

Item Number: 150-168

MSRP: ~~$6.50~~

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Black railroad ties and nickel silver rail. One 3' (36") section.

Rail-joiners not included.

Additional Product Information

Manufacturer/Brand: Atlas
Mfg Part #: 0168
Scale: HO What's this?
Choking Hazard - May contain small parts. Not for children under 3 yrs.
Model railroad items are not intended for unsupervised children under 14 years of age.