the ac buses in delhi are much powerful ones , the red ones launched common wealth games are really good, they are cng . the ones in hyd are diesel counterparts and less powerful , the state of maintainance is pathetic , indian manufactures need to understand that stu have poor maintainance standards and should come with AMC or some other methodology . The state of affairs in both buses posted is completely different , the green bus has poor insulation from doors while the blue one is better . volvos are not practical in india because they cost a bomb , mostly volvos running in india are in loss because operating dynamics doesnt help indian conditions. the efficiency of that apsrtc volvo bus is 1.5-1.8 where marco delivers 3.5, The auto tranny in these marcos is the crappiest part , tata has a marco hybrid which is doing trials , it is really well built , In europe (spain) tata has the same mechanicals and chassis but the bus built by hispano and difference is phenominal . the divo coach built by hispano is a very good bus ,and when the same shell reached indian waters tata again messed it up completely, they should improve on putting the product thoroughly ,