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@hippy
Many track bicycles use a wider chain than is common on multi-speed bicycles. Derailer-type chain has a nominal internal width of 3/32". Single-speed bicycles, including most track bicycles, use the wider 1/8" size. You can buy fixed-gear sprockets in both sizes.
I would generally advise using the 3/32" (derailer) size. It is lighter, more compatible with your existing chainwheels, and likely to run smoother if the chainline is less than perfect, due to beveled side plates. In my experience, 3/32" chain is no less durable or reliable than 1/8".
http://www.sheldonbrown.com/fixed.html#chain
I use both types. No preference towards either. Just make sure your driveline is the same, ie. 3/32 sprockets with 3/32 chain.
You 'can' mix and match but some people complain of noise, etc.