context: As of 2010, the operational length of the Kursk region's railway lines is 850.6 km, 84.14 km of access roads. The length of electrified lines is 299.4 km [22].
question: How much is the operational length of railways in the Kursk region?
answers.text: 2010, the operational length of the Kursk region's railway lines is 850.6 km