These are some Imp Urls  from u ll get information of Indian Railways Services , Indian Telecom Services , and for Civil and Electrical Engineering:

For Indian Railways (common to all four Branches ):

[Economic Survey Ch10] (Part 5 of 5) Railways: Anubhuti, Spart, Project Unigauge, Budget, World Heritage

[Economy] Dedicated Freight Corridors (DFC), High Speed Rail Corridors, Rail Tariff Regulatory Authority, Issues, Reforms in Indian Railways

[Infrastructure] PPP challenges & reforms, 3P-India, highway projects, Industrial corridors, DMIC vs DFC, Golden vs Diamond quadrilateral

[Infrastructure] Rail-Budget 2014, Tariff Authority, Biodiesel, Biotoilets, FDI & more

For Indian Telecom Service :

[Economic Survey Ch10] (Part 3 of 5) Telecommunication and IT: E-Nayana, BOSS, SAMEER, NIXI

[Economy] 2G scam, Spectrum refarming, Sistema controversy, Allocation of Natural Resources explained

For Civil Engineering:

[Economic Survey Ch10] (Part 4 of 5) Services: Road Transport, Shipping, Aviation, sethusamudram, FANS, Greenfield airports

For Electrical Engineering :

[Economic Survey Ch11] Infrastructure (Part 2 of 2) Electricity, Renewable Energy, Bagasse Cogeneration