how long is a railcar

{"cid":"91202312","title":"60Si2MnA \/ 38Si7 Spring Steel Steel Rail Wheels for Metro Transportation","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/53\/e2\/bcb7313d6ff74d2feacbe107bdee-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"kingrail","Model Number":"200mm","Minimum Order Quantity":"Negotiable","Delivery Time":"1-30 working days","Certification":"ISO","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"1 million pcs\/year","Packaging Details":"standard export package, or as per customer request","Surface Coating":"Red painting (anti-rust, identification)","Corrosion & Wear Protection":"Red painting acts as an anti-rust layer and allows easy identification on track. Alternative coatings (galvanizing, epoxy) available on request.","Durability in Harsh Conditions":"Performs reliably under high vibration, heavy loads, and temperature variations. Suitable for high-speed rail, metro, tram, and heavy freight applications.","Superior Fatigue Resistance":"Manufactured from alloy spring steel (such as 60Si2MnA, 38Si7). Heat-treated (quenching & tempering) to achieve hardness of 44\u201348 HRC, ensuring long fatigue life (\u2265 5 million cycles).","Product Category":"Steel Rail Wheels","Standards & Quality Control":"Produced according to UIC, AREMA, and EN standards. Strict testing: dimensional accuracy, hardness, fatigue, corrosion resistance.","Material":"60Si2MnA \/ 38Si7 spring steel","Applications":"Tram, Metro, Railway mainlines, Heavy-haul"}}