Caterpillar Earnings Rise But Shares Fall  CHICAGO (Reuters) - Caterpillar Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CAT.N target=/stocks/quickinfo/fullquote"&gt;CAT.N&lt;/A&gt; said on  Thursday its quarterly earnings more than doubled on strong  demand for its engines and heavy earth-moving equipment, but  concerns about high costs helped drag the shares down more than  4 percent.