Replacement & modification of existing 18 nos. Light Fabricated Height Gauges ( NN- 195, 196, 197, 198, 199, 201, 202, 203, 204, 205, 206, 210, 212 & 217 ) between DDNI- DPRA, NN- 227 between DPRA- SNCA, NN- 262 between CGON- MRZA, NN- 267 & 269 between MRZA- AZA section of Rangiya Division of N. F. Railway in connection with the Railway Electrification work of Group- 256