Establishment of Track Quality Index Standard Recommendations for Beijing Metro

Table 2

The allowable minimum curve radius on metro tracks [9].

Track category	General conditions		Difficult conditions
	Trains of group A	Trains of group B	Trains of group A	Trains of group B
Main line
≤ 80 km/h	350	300	300	250
80 km/h ≤ ≤ 100 km/h	550	500	450	400
Connection and siding tracks	250	200	150
Yard tracks	150	110	110