Kevin Boone
Executive Vice President and Chief Commercial Officer at CSX
Thank you. Mike and I have been spending a lot of time together and it is really great to have you on the team. To start, I'm pleased to say that our improving service levels are a key differentiator in the marketplace. I can't thank the entire team enough for all the hard work. These improvements are being recognized by our customers and are leading to new initiatives and discussions around how CSX can partner with our customers for growth.
Our ability to grow profitably requires us to be proactive, quickly adapt to changing markets and think differently. I'm proud of how well we have been able to coordinate with operations to drive both growth and efficiencies. With Mike in his role, we have only seen these efforts accelerate.
It's no surprise that overall economic conditions remain uncertain, but it has been encouraging to see gradually improving sequential trends across several of our end markets over this past quarter. We see many, many reasons to be optimistic as we continue to build our business pipeline with an eye towards 2024 and beyond.
Turning to Slide 10 to look at our merchandise performance for the quarter. Our revenues were down modestly compared to last year on flat volumes, as solid core pricing gains were offset by lower fuel surcharge and negative mix effects in certain markets. Our automotive business continued to show strength, with higher production and business wins driving a 19% increase in volume year-over-year.
Minerals continues to perform very well, sustained by infrastructure activity that is supporting new cement facilities and healthy demand for aggregates. Metals performance has also benefited from our service levels, leading to competitive wins and solid demand. Our chemical franchise, while challenged, has begun to stabilize and even showed some promising improvement in domestic plastics over the quarter. Fertilizer revenue growth was strong in the quarter despite volumes that were impacted by weaker short-haul movements with production challenges in Florida.
As we expected, the strong southeastern corn crop meant less rail volume for grain. And forest products remains one of the most challenged areas with many mills still taking meaningful downtime.
As we start the fourth quarter, we are encouraged by the early October volume trends, with most markets showing sequential momentum. We anticipate a strong rebound for ag and food as a strong mid Midwest harvest kicks in. And across other markets, we expect our service improvements to drive opportunities to win in the marketplace as we focus on modal conversion.
Turning to Slide 11. Third quarter coal revenue declined 5% even though volumes were very strong, growing 9% compared to last year. Export demand continued to be a major volume driver, growing 26% with the hot summer also supporting solid domestic demand. Strong coal volumes minimize the effects of lower international benchmark prices, which were setting all-time records this time last year. The key difference was met coal pricing, where global benchmarks were much lower than in the same period last year.
Sequentially, our coal RPU declined 11% compared to our guidance of mid-teens decline, with stronger-than-expected shipments to longer length of haul Southern utility customers driving the moderate outperformance.
Looking ahead to the last quarter of the year, we expect export markets to remain strong and are pleased with the increases in international benchmarks that we've seen over the last several weeks. On the domestic side, we have seen stockpiles normalize and demand into 2024 will be driven by winter weather and related demand needs. The increase in global benchmark prices should benefit our cold yields next quarter. So I would remind you that we have a diverse portfolio of met customers and we have seen U.S.-based met coal benchmarks and those in other regions lag spot prices in Australia.
Turning to intermodal on Slide 12. As a whole, the business remained challenged with revenue declining by 14% and total volume decreasing by 7%. Overall RPU declined by 8% year-over-year, with the impact of lower fuel surcharge accounting for the decline, partially offset by positive price. That said, we are seeing encouraging trends from our domestic business where volume turned positive on a year-over-year basis early in the summer and that's continued to improve since then. We offer a diverse mix of transportation solutions within domestic intermodal and we've seen great results from our strong channel partnerships and our direct relationships with major retailers. Our team has been successful in converting traffic off the highway in a market facing plentiful truck capacity, which is a testament to the team and the market-leading service product.
Meanwhile international intermodal activity has stabilized, but it remains weak. We haven't seen any clear signs of a positive inflection yet. Retailers remain concerned about the health of the consumer. And though destocking may have slowed, we haven't seen this turn into sustained increases in order rates or imports. For the rest of the year, we expect trends to largely continue as they were over the third quarter with domestic gradually strengthening, supported by our team's strong sales efforts.
While we prepare for the turning point for international, recall that we saw meaningful drop-offs in our intermodal volume in the back half of the fourth quarter and 2022 as market slowed substantially, which will benefit our reported growth rate for the current quarter.
Slide 13 provides a clear illustration of the encouraging signs we're seeing within our intermodal business. On a year-over-year basis, domestic intermodal has shown a favorable trend since the beginning of 2023, turning positive around midyear and steadily improving since. While international volumes remain lower compared to 2022, we've seen stability in the past few months. Altogether, across all of our businesses, our team continues to push forward across multiple initiatives aimed at winning wallet share, converting truck and [Phonetic] traffic and bringing new customers to the railroad.
We remain confident that our leading service performance will continue to provide opportunities to win business. And we know that we have the resources and capacity in place to deliver growth when the market environment inflects. I'm proud of what the collective CSX team has accomplished this quarter. I'm excited about all the potential ahead.
Now I'll turn it over to Sean to discuss financials.