Kevin Boone
Executive Vice President, Sales & Marketing at CSX
Thank you, Jamie. As Joe noted, despite headwinds across many of our markets, the team was able to capitalize on strong year-over-year improvement in service. Importantly, as service has improved, there's opening up opportunities to discuss new business with our customers where we are seeing in our year-to-date pipeline up 30%. I'm proud of the team and the progress we have made. There remains a lot of work ahead of us as we focus on building our pipeline of growth opportunities.
Initiatives including whiteboarding sessions with customers, increasing direct engagement with small and medium-sized shippers, bringing new technology tools to better serve our customers and finally, expanding our reach by leveraging our transload network and collaborating with both with our short-line and Class 1 partners are just a few of the focus areas for the team as we move into the back half of the year.
Turning to Slide 11, our strong merchandise performance continued into the second quarter, with revenue increasing 5% even as our fuel surcharge declined substantially on lower diesel prices. This growth was driven by 3% higher volume, compared to last year and a 1% all-in increase in revenue per unit. As we saw in the first quarter, our customers are seeing improved service levels, which is opening up opportunities and encouraging them to bring more of their business to our network.
For the quarter, we saw many of the market trends continue from the start of the year. In automotive, we are seeing more consistent production and we've seen our improved service lead to new opportunities and business wins. Minerals benefited from strong construction demand for aggregates in our improving cycle times. And our metals and equipment business continues to be a bright spot, with volumes up across steel, scrap, and equipment. We've been successful in expanding our commercial relationships and translating our service product and to convert new business wins.
I'm also pleased that our fertilizer business delivered higher volumes year-over-year, supported by strong domestic shipments of potash and nitrogen. On the other side, chemicals continues to be soft as demand remains challenged across our broad book of business. For this products [Technical Issues] products faces headwinds in paper and pulpboard. We've also seen some slowdown in export grains for ag and food.
For the second-half of the year, we expect to build on the successes we've had to win more wallet share of our existing customers, while continuing our efforts to attract new customers away from truck. We expect auto, minerals, and metals markets to remain supportive and will be important contributors to volume growth over the remainder of 2023. We look for destocking activity to wind down in many of the markets we serve including chemicals, so timing there remains uncertain.
What's most important is that our team is not sitting back and waiting for markets to turn. We are pushing forward with our own initiatives. Our business development group has been making great progress with our Select Site program and expanding our pipeline of partner projects. And we're strategically investing in developing new locations, providing additional transloading capabilities and investing in railcars to drive more business to CSX.
Turning to Slide 12, second quarter coal revenue decreased 2% as a 4% volume gain was more than offset by a 6% decline in revenue per unit, driven by lower export coal benchmarks. We saw continued growth in export volumes due to beneficial cycle times, good performance at our Curtis Bay terminal and a push among our coal customers to move more tonnage into the overseas markets. Domestic utility shipments declined as we expected, as low natural gas prices weighed on coal burn. Though demand in Southern utilities remained favorable.
We expect momentum in the export markets to continue over the second-half of the year, with CSX volume supported by new mine capacity and coal producers making opportunistic shipments into the international markets. On the domestic side, we see tougher comparisons versus a strong second-half last year. But the hot summer is providing a helpful tailwind early in this quarter and just recently we are seeing a few customers looking for additional sets.
Of course, as international pricing benchmarks have eased from last year's record highs, we will see an impact on our revenue per unit into the third quarter. Most of our exports are met coal with the benchmark around $225 per metric ton. We anticipate our third quarter all-in coal RPU will sequentially decline by a mid-teens percentage. Current international benchmark prices remained very healthy and supportive of strong production into the back half of the year.
Now turning to Slide 13, second quarter revenue decreased by 18%, due to a 10% decline in volume, and a 9% reduction in revenue per unit, reflecting the effect of lower fuel surcharge, as in the first quarter, international intermodal drove most of the volume decrease with the business seeing headwinds from declining imports and inventory destocking. Volumes in the domestic business showed a much more modest decline. [Indecipherable] by the good progress we continue to make with rail conversions and the team's efforts to identify new markets and lanes. Our best-in-class Eastern service product continues to position us for truck conversion in the quarters and years ahead.
Looking forward, while we and our customers are still looking for a rebound in the international business, pressing ahead with our own initiatives, we brought on a new shipper late in the quarter that recognize the value of our strong service product. And we're seeing other opportunities in new lanes, growing activity at inland ports.
Domestically, we're encouraged by many opportunities to work more closely with all of our Class 1 partners to target truck conversion. Just one example of this is the agreement we reached with CPKC just a few weeks ago to create a new interchange in Alabama that will link our customers across the Southeast with key markets in Texas and Mexico. We think there's much more opportunities for new creative partnerships that can help bring even more business to all of the railroads. And we remain very excited about the opportunities ahead of us.
Now I will turn it over to Sean to discuss the financials.