A railroad rail track pad composition comprising an ethylene/α-olefin/non-conjugated polyene random copolymer (A), clay (B), and a sulfur atom-containing silane coupling agent (C), wherein the ethylene/α-olefin/non-conjugated polyene random copolymer (A) is: a copolymer comprising structural units derived from ethylene [a], an α-olefin [b] having 3 to 20 carbon atoms, a non-conjugated polyene [c-1] comprising in a molecule only one partial structure represented by the following structural formula (I) or (II): wherein (I) is a partial structure of a cyclic olefin, and a non-conjugated polyene [c-2] comprising in a molecule a total of two or more partial structures selected from the group consisting of structural formulas (I) and (II), and satisfying conditions of the following to : the structural unit derived from the α-olefin [b] having 3 to 20 carbon atoms is present at 10 to 50 mole % in 100 mole % of all structural units, a sum of a mole % of the structural unit derived from the non-conjugated polyene [c-1] and a mole % of the structural unit derived from the non-conjugated polyene [c-2] is 1.0 to 6.0 mole %, a ratio of the mole % of the structural unit derived from the non-conjugated polyene [c-1] to the mole % of the structural unit derived from the non-conjugated polyene [c-2] ([c-1]/[c-2]) is 75/25 to 99.5/0.5, Mooney viscosity measured at 100°C [ML 1+4 (100°C)] is 10 to 90, an apparent iodine value of the structural unit derived from the non-conjugated polyene [c-2] is 0.1 to 3.0 g/100 g, and the following formula (i) is satisfied: 50 > activation energy of the flow Ea kJ / mol > 35 wherein the clay (B) is surface-treated with a silane coupling agent. a copolymer comprising structural units derived from ethylene [a], an α-olefin [b] having 3 to 20 carbon atoms, a non-conjugated polyene [c-1] comprising in a molecule only one partial structure represented by the following structural formula (I) or (II): wherein (I) is a partial structure of a cyclic olefin, and a non-conjugated polyene [c-2] comprising in a molecule a total of two or more partial structures selected from the group consisting of structural formulas (I) and (II), and satisfying conditions of the following to : the structural unit derived from the α-olefin [b] having 3 to 20 carbon atoms is present at 10 to 50 mole % in 100 mole % of all structural units, a sum of a mole % of the structural unit derived from the non-conjugated polyene [c-1] and a mole % of the structural unit derived from the non-conjugated polyene [c-2] is 1.0 to 6.0 mole %, a ratio of the mole % of the structural unit derived from the non-conjugated polyene [c-1] to the mole % of the structural unit derived from the non-conjugated polyene [c-2] ([c-1]/[c-2]) is 75/25 to 99.5/0.5, Mooney viscosity measured at 100°C [ML 1+4 (100°C)] is 10 to 90, an apparent iodine value of the structural unit derived from the non-conjugated polyene [c-2] is 0.1 to 3.0 g/100 g, and the following formula (i) is satisfied: 50 > activation energy of the flow Ea kJ / mol > 35 the structural unit derived from the α-olefin [b] having 3 to 20 carbon atoms is present at 10 to 50 mole % in 100 mole % of all structural units, a sum of a mole % of the structural unit derived from the non-conjugated polyene [c-1] and a mole % of the structural unit derived from the non-conjugated polyene [c-2] is 1.0 to 6.0 mole %, a ratio of the mole % of the structural unit derived from the non-conjugated polyene [c-1] to the mole % of the structural unit derived from the non-conjugated polyene [c-2] ([c-1]/[c-2]) is 75/25 to 99.5/0.5, Mooney viscosity measured at 100°C [ML 1+4 (100°C)] is 10 to 90, an apparent iodine value of the structural unit derived from the non-conjugated polyene [c-2] is 0.1 to 3.0 g/100 g, and the following formula (i) is satisfied: 50 > activation energy of the flow Ea kJ / mol > 35 wherein the clay (B) is surface-treated with a silane coupling agent. <EOS>