A friend of mine has about 5000 railroad ties,they are about 20 years old ,most of the creosote is worn away.These ties are rock solid mostly if not all oak,all very dry,he wants to unload to woodburners,35$ a cord which is solid with no air space.What's your opinions? I don't think it would be good for a cat stove.I cut a segment off one it cut easily and the wood was hard and dry.