Design Scheme for Continuous Long-large Steep Slopes in Suburban Railways of Mountainous Cities

Abstract

Objective In mountainous cities, setting up long-large steep slopes in suburban railways can effectively reduce route lengths and lower construction costs. However, this setup poses challenges for train operation, disturbing train operational safety. To address the technical difficulties caused by continuous long-large steep slopes, and to meet requirements for line capacity, departure intervals, and train speed, it is necessary to study the design scheme for such slopes in suburban railways of mountainous cities. Method Using the longitudinal profile design of the suburban railway line from Chongqing city center to Nanchuan Line Dongwenquan Station-Lixianghu Station Interval as the engineering background, simulations are conducted for checking the calculation of train traction and braking performance on slopes, rescue capability, and brake shoe thermal capacity. Corresponding measures are proposed from various aspects, including vehicle performance, departure intervals, rescue measures for operating trains, and train operational safety guarantee. Result & Conclusion The longitudinal profile of suburban railway continuous long-large steep slopes of s in mountainous cities adopts a combination of continuous steep slopes and gentle slopes, namely a combination of ′a slope with 35‰ gradient for 1 000 m track and a slope with 18.6‰ gradient for 250 meter track′. This design can meet the requirements for train traction start-up, fault operation, slope braking, and rescue operations, thereby ensuring train operational safety.

Keywords

• mountainous city
• suburban railway
• long-large steep slope