Variable		Unit	Deduction criteria	Deducted score	Total deduction score of initial variables	Total deduction score of key variables
Geometry system	Elevation/mm	Unit	8	3	9	9
	Gauge/mm		+8/−6	3	6	6
	TQI		≥15	40	40	40
Total deduction score for geometry system					55	55
Rail system	Rail gap	position	More than three consecutive	3	6	0
	Spalling and chipping		Depth > 2 mm	4	16	16
	Abnormal light band		Length > 3 cm	3	6	6
	Top surface scratch		Depth > 2 mm	3	6	0
	Side wear		>6 mm	4	12	12
Total deduction score of rail system					46	34
Connecting part	Fastener missing	piece	Number of missing	2	8	8
	Spike head falling-off		Falling off	2	4	0
	Rubber gasket skewed		Skew	2	2	2
	Rubber gasket broken		Break off	2	2	0
Total deduction score of connecting part system					16	10
Sleeper system	Break off	piece	Broken	2	2	0
	Sleeper chipping		Chipping off	2	2	2
	Number of sleepers		Less than specified number	2	4	4
	Sleeper gap		Larger than structural gap	2	4	4
Total deduction score of sleeper system					12	10
Subgrade ballast	Thickness	Centimetre	>4/5, 3/5 - 4/5	4	4	4
	Ballast bed smudging	Hole	Ballast bed smudging	2	4	4
	Ballast bed compaction	Hole	Compaction	2	6	0
	Ballast bed smudgy	position	Dirty	2	4	4
Total deduction score of subgrade ballast system					18	12
Total mass	Total mass of passing trains	Mass	Passing mass	20	20	20
Total deduction score of operating system					20	20