Caterpillar Inc. is raising machine prices at least 2% and up to 6% this coming January to cover the cost of new emissions equipment related to the next generation of off-road diesel engines, it reports in a regulatory filing dated September 30. The Peoria, Ill.-based manufacturer told ENR earlier this year it would raise machine prices 12%, or about 4% per year over the next three years, as it adds new tailpipe controls to comply with U.S. Environmental Protection Agency Tier 4 regulations, which phase in this January and finalize in 2014 (ENR 2/22 p. 13). Cat also says it is raising prices up to an additional 2% globally due to “general economic conditions.”