9. Segment Information We have three reportable segments: Railroad and Utility Products and Services, Performance Chemicals and Carbon Materials and Chemicals. Our reportable segments contain multiple aggregated business units since management believes the long-term financial performance of these business units is affected by similar economic conditions. The reportable segments are each managed separately because they manufacture and distribute distinct products with different production processes. Our RUPS segment sells treated and untreated wood products, manufactured products and services primarily to the railroad and public utility markets. Railroad products and services include procuring and treating items such as crossties, switch ties and various types of lumber used for railroad bridges and crossings and the manufacture of rail joint bars. The segment also manufactures treated wood utility transmission and distribution poles for utility and cooperative utility companies and treated wood pilings used for construction applications. In addition, RUPS operates a railroad services business that conducts engineering, design, repair and inspection services for railroad bridges as well as a business related to the recovery of used crossties. Our PC segment develops, manufactures, and markets wood preservation chemicals and wood treatment technologies and services a diverse range of end-markets including infrastructure, residential and commercial construction, and agriculture. Our CMC segment is primarily a manufacturer of creosote, carbon pitch, naphthalene, phthalic anhydride and carbon black feedstock. Creosote is used in the treatment of wood and carbon black feedstock is used in the production of carbon black. Carbon pitch is used in the production of aluminum and steel in electric arc furnaces. Naphthalene is used for the production of phthalic anhydride and as a surfactant in the production of concrete. Phthalic anhydride is used in the production of plasticizers, polyester resins and alkyd paints. We evaluate performance and determine resource allocations based on a number of factors, including operating profit or loss from operations and earnings before interest, taxes, depreciation and amortization (EBITDA). Operating profit does not include other loss, interest expense, income taxes or operating costs of Koppers Holdings Inc. The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2019. Intersegment transactions are eliminated in consolidation. Contract Balances The timing of revenue recognition in accordance with ASC 606, Revenue from Contracts with Customers, results in both billed accounts receivable and unbilled receivables, both classified as accounts receivable, net of allowance within the condensed consolidated balance sheet. Contract assets of $5.6 million and $5.1 million are recorded within accounts receivable in our RUPS segment, net of allowance within the consolidated balance sheet as of March 31, 2020 and December 31, 2019, respectively. The following table sets forth certain sales and operating data, net of all intersegment transactions, for our segments for the periods indicated: Three Months Ended March 31, 2020 2019 (Dollars in millions) Revenues from external customers: Railroad and Utility Products and Services $ 190.0 $ 166.1 Performance Chemicals 111.4 99.0 Carbon Materials and Chemicals (a) 100.5 111.8 Total $ 401.9 $ 376.9 Intersegment revenues: Railroad and Utility Products and Services $ 0.0 $ 0.3 Performance Chemicals 3.2 3.1 Carbon Materials and Chemicals 18.0 17.9 Total $ 21.2 $ 21.3 Depreciation and amortization expense: Railroad and Utility Products and Services $ 4.9 $ 4.8 Performance Chemicals 4.5 4.9 Carbon Materials and Chemicals (b) 4.1 3.9 Total $ 13.5 $ 13.6 Operating profit (loss): Railroad and Utility Products and Services $ 9.2 $ 8.7 Performance Chemicals 4.1 12.8 Carbon Materials and Chemicals (c) 0.7 3.3 Corporate (0.4 ) (0.5 ) Total $ 13.6 $ 24.3 (a) Revenue excludes KJCC discontinued operations of $9.9 million and $58.0 million for the three months ended March 31, 2020 and 2019, respectively. (b) Depreciation and amortization expense excludes KJCC discontinued operations of $1.0 million for the three months ended March 31, 2020 and 2019. (c) Operating profit (loss) excludes KJCC discontinued operations of $(5.1) million and $4.1 million for the three months ended March 31, 2020 and 2019, respectively. The following table sets forth revenues for significant product lines, net of all intersegment transactions, for our segments for the periods indicated: Three Months Ended March 31, 2020 2019 (Dollars in millions) Railroad and Utility Products and Services: Railroad treated products $ 112.0 $ 88.6 Utility poles 61.9 54.5 Rail joints 6.4 8.3 Railroad infrastructure services 6.0 8.8 Other products 3.7 5.9 Total 190.0 166.1 Performance Chemicals: Wood preservative products 107.6 96.4 Other products 3.8 2.6 Total 111.4 99.0 Carbon Materials and Chemicals: Pitch and related products 50.2 62.8 Creosote and distillates 15.2 15.9 Phthalic anhydride and other chemicals 23.5 21.0 Naphthalene 5.0 6.4 Other products 6.6 5.8 Total 100.5 111.8 Total $ 401.9 $ 376.9 The following table sets forth tangible and intangible assets allocated to each of our segments as of the dates indicated: March 31, 2020 December 31, 2019 (Dollars in millions) Segment assets: Railroad and Utility Products and Services $ 572.4 $ 562.2 Performance Chemicals 468.5 457.7 Carbon Materials and Chemicals (a) 485.5 502.1 All other 46.7 42.6 Total (a) $ 1,573.1 $ 1,564.6 Goodwill: Railroad and Utility Products and Services $ 120.2 $ 120.7 Performance Chemicals 172.5 175.4 Total $ 292.7 $ 296.1 (a) The Carbon Materials and Chemicals segment includes $67.5 million and $76.4 million of discontinued operations assets held for sale related to our KJCC business at March 31, 2020 and December 31, 2019, respectively.