Sales of Caterpillar's marine engines were up 48 percent last month compared to April 2008, the company said in a report filed this week with the Securities and Exchange Commission.
Also, the company reported sales were up 12 percent in March and 19 percent in February, compared to those months in 2008.
No specific unit numbers were given in the report.
Total engine sales, however, were down in March and April by 2 percent and 9 percent, respectively. Caterpillar reported a 1 percent increase in overall engine sales for February.