why not fixed standards be made for all durantos & prime s.f.
dutanros : 1 h1., 3 - 2tier ac ., 7 3-ac ., 8 - sleepers ., 2 p.c., 1 eog + hogg loco
prime...
more... super fast ., 3 ac be 4 or 5 ., increase sleeper by 2 ., 2 ac be 2 ., + 4 sittings ., 2 pantry + eog & hogg loco
also 2 coaches be replaced with 2 hcpv for urgent - perishable cargo