A railway component, wherein the component is a molded or extruded train seat component or an extruded or molded interior train cladding, comprising a thermoplastic composition comprising, based on the total weight of the composition: 3.5 to up to 10 wt.% of an aromatic organophosphorus compound; 88 to up to 98 wt.% of a first polymer, or a second polymer, or a combination comprising at least one of the foregoing polymers; and optionally, up to 5 wt.% of an additive selected from a processing aid, a heat stabilizer, an ultra violet light absorber, a colorant, or a combination comprising at least one of the foregoing, wherein the first polymer comprises: 2 to 20 mol% of bisphenol-A carbonate units of the formula greater than 60 to 98 mol% of isophthalic acid-terephthalic acid-resorcinol ester units of the formula and optionally, 1 to 20 mol% resorcinol carbonate units of the formula isophthalic acid-terephthalic acid-bisphenol-A ester units of the formula or a combination comprising at least one of the foregoing; the second polymer comprises 1 to 20 mol% of bisphenol A carbonate units of the formula greater than 60 to 90 mol% of isophthalic acid-terephthalic acid-resorcinol units of the formula and siloxane units in an amount effective to provide 0.1 to 10 wt.% of siloxane units, based on the weight of the second polymer, wherein the siloxane units are of the formula or a combination comprising at least one of the foregoing, wherein E has an average value of 2 to 90; the aromatic organophosphorus compound is of the formula wherein each of R 16, R 17, R 18 and R 19 is phenyl, and X is of the formula each n is 1, and q is from 1 to 5; and wherein a sample of the thermoplastic composition has: a smoke density after 4 minutes (Ds-4) of equal to or less than 300 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, an integral of the smoke density as a function of time up to 4 minutes of equal to or less than 600 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, a maximum average heat release (MAHRE) of equal to or less than 90 kW/m 2 measured in accordance with ISO 5660-1 on a 3 mm thick plaque at 50 kW/m 2, and a ductility in multiaxial impact of 100%, measured at +23°C at an impact speed of 4.4 m/second in accordance with ISO 6603 on 3.2 mm thick discs, and when the component is an extruded or molded interior train cladding, a sample of the thermoplastic composition further has a critical heat flux at extinguishment of equal to or greater than 20 kW/m 2 measured in accordance with ISO 5658-2 on a 3 mm thick plaque. 3.5 to up to 10 wt.% of an aromatic organophosphorus compound; 88 to up to 98 wt.% of a first polymer, or a second polymer, or a combination comprising at least one of the foregoing polymers; and 2 to 20 mol% of bisphenol-A carbonate units of the formula greater than 60 to 98 mol% of isophthalic acid-terephthalic acid-resorcinol ester units of the formula and optionally, 1 to 20 mol% resorcinol carbonate units of the formula isophthalic acid-terephthalic acid-bisphenol-A ester units of the formula or a combination comprising at least one of the foregoing; each of R 16, R 17, R 18 and R 19 is phenyl, and X is of the formula each n is 1, and q is from 1 to 5; and each n is 1, and q is from 1 to 5; and wherein a sample of the thermoplastic composition has: a smoke density after 4 minutes (Ds-4) of equal to or less than 300 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, an integral of the smoke density as a function of time up to 4 minutes of equal to or less than 600 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, a maximum average heat release (MAHRE) of equal to or less than 90 kW/m 2 measured in accordance with ISO 5660-1 on a 3 mm thick plaque at 50 kW/m 2, and a ductility in multiaxial impact of 100%, measured at +23°C at an impact speed of 4.4 m/second in accordance with ISO 6603 on 3.2 mm thick discs, and when the component is an extruded or molded interior train cladding, a sample of the thermoplastic composition further has a critical heat flux at extinguishment of equal to or greater than 20 kW/m 2 measured in accordance with ISO 5658-2 on a 3 mm thick plaque. a smoke density after 4 minutes (Ds-4) of equal to or less than 300 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, an integral of the smoke density as a function of time up to 4 minutes of equal to or less than 600 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m 2, a maximum average heat release (MAHRE) of equal to or less than 90 kW/m 2 measured in accordance with ISO 5660-1 on a 3 mm thick plaque at 50 kW/m 2, and a ductility in multiaxial impact of 100%, measured at +23°C at an impact speed of 4.4 m/second in accordance with ISO 6603 on 3.2 mm thick discs, and when the component is an extruded or molded interior train cladding, a sample of the thermoplastic composition further has a critical heat flux at extinguishment of equal to or greater than 20 kW/m 2 measured in accordance with ISO 5658-2 on a 3 mm thick plaque.