CTR ( Rly. Bd. Letter 90/Track-III/TK/72 dt. 18.7.90)
CTR=100-(ULA+URA+TA+GA+ALB+ARB)
Rev. CTR (item 840 of 66th TSC)
RCTR=100-(ULB+URB+TB+GB+0.5ALB+0.5ARB) -0.25(ULA+URA+TA+GA)
TQI ( RDSO Report no. C-223)
TQI=8(U2+2T+G+A)
TGI ( Rly. Bd. Letter 94/Track-III/TK/23 dt. 25/31.08.95)
TGI(for a block) =(2UI+TI+GI+6AI)/10
TGI for a KM = (Sum of TGI of all blocks) / No. of blocks
UI=100e-(SDUm-SDUr)/(SDUur-SDUr)
SDUm=(SDU2l+SDU2r)/2
TI=100e-(SDTm-SDTr)/(SDTur-SDTr)
GI=100e-(SDGm-SDGr)/(SDGur-SDGr)
AI=100e-(SDAm-SDAr)/(SDAur-SDAr)
SDAm=(SDA1l+SDA1r)/2
Maintenance Guidance using TGI Values
As per Rly. Bd.’s letter Dated 30.12.96
