Last week, the Intermodal Association of North America (IANA) announced intermodal container volume reached a record-high level of 13.1 million moves in 2012, which was an increase of 5.9 percent from 2011's level and surpassing the level set in 2007, the previous benchmark year.As Progressive Railroading reported on Feb. 7, intermodal shipments totaled 14.6 million units in 2012, a 4 percent year-over-year increase, according to IANA. Domestic container volume, which rose 12.2 percent to 5.5 million units, was the driving factor behind the record-high mark in intermodal traffic last year, IANA officials said. The IANA report came on the heels of the Association of American Railroads' (AAR) 2012 traffic wrap-up, which also showed growth in intermodal business. Last year was the second-highest intermodal volume on record, according to AAR.Whether you follow IANA's or AAR's numbers, the intermodal story last year is one of growth. Will that trend continue? Time will tell. In the meantime, consider sharing your thoughts on the intermodal business and its impact on railroading by posting a comment in response to this blog, or by answering this week's poll question on ProgressiveRailroading.com.