Establishment of Track Quality Index Standard Recommendations for Beijing Metro

Table 8

Percentiles of track quality quantities over all the 14 tracks as a whole.

#	Percentile	Surface	Alignment	Gauge	Cross level	Twist	TQI
1	70th	2.18 2	1.97 2	1.36	1.61	1.44	12.70
2	75th	2.29 2	2.11 2	1.48	1.76	1.51	13.55
3	80th	2.41 2	2.26 2	1.65	1.91	1.61	14.51
4	85th	2.55 2	2.43 2	1.88	2.13	1.73	15.70
5	90th	2.70 2	2.63 2	2.25	2.49	1.87	17.27