suggest making of standarised racks say 1 -2ac + 3 to 4 3 ac + 1 pc + 9 or 10 sleepers & 5 to 6 gen { inclusive guard } so that late arrival on terminus stations say at hwh / cstm /maas / hw / ghy / ndls ., if has 1 or 2 additional racks can easily overcome delays ., standard racks are to be created be it normal ich or lhb