12011 cannot be extended to anywhere due to primary maintenance at NDLS.
12045/46 can be extended to Faridabad and 12005 and 12006 can be extended to Gurgaon, but that will block 1 platform for quite sometime at both stations. Faridabad can still manage 1 blocked platform for couple of hours, Gurgaon cannot do with 1 blocked platform for 5+ hours.