| 1 | e2E Rail, Bengaluru. |
| 2 | Grand Rail Ventures India Pvt Ltd. |
| 3 | Aarvee Associates. |
| 4 | Barsyl. |
| 5 | Wabtec Corporation. |
| 6 | Serco, Dubai. |
| 7 | Alstom. |
| 8 | Balfour Beatty. |
| 9 | Mott MacDonald. |
| 10 | Amey Limited. |
| 11 | Coyle Rail Limited. |
| 12 | Ansaldo STS. |
| 13 | L&T. |
| 14 | Bombardier. |
| 15 | Scomi Rail. |
| 16 | Medha Servo Drives Pvt.Ltd. |
| 17 | Cyient. |
| 18 | Hitachi. |
| 19 | Siemens. |
| 20 | Parsons Brinckerhoff India. |
| 21 | Adani Group. |
| 22 | Unirail, Secunderabad. |
| 23 | AECOM. |
| 24 | Kalindee Rail Nirman India Ltd. |
| 25 | Railtranz Systems Limited. |
| 26 | Quatro Rail Tech Solutions. |
| 27 | SOWiL Limited. |
| 28 | AR Rail Vikas Services Pvt Ltd. |
| 29 | Arup Rail Singnalling Services Pvt Ltd., Australia. |
| 30 | URS Consulting India Pvt. Ltd. |
| 31 | Mumbai Metro One Pvt. Ltd. |
| 32 | Bechtel Corporation. |
| 33 | Keolis Hyderabad. |
| 34 | Arcadis India. |
| 35 | Kyosan India Pvt. Ltd. |
| 36 | Veolia Transport. |
| 37 | Softech Engineers and Traders Pvt. Ltd |
| 38 | Global Rail. |
| 39 | Derby. |
| 40 | TVM Signaling and Transportation Systems Pvt. Ltd. |
| 41 | Kiwi Rail. |
| 42 | Signotech. |
| 43 | RVNL. |
| 44 | Halcrow A ch2m Hill Company. |
| 45 | Thales. |
| 46 | Tech Mahindra. |
| 47 | TCS. |
| 48 | Quest Global. |
| 49 | Capgemini. |
| 50 | DB International. |
| 51 | Systra. |
| 52 | JMD Rail. |
| 53 | Railsys. |
| 54 | HCL. |
| 55 | CTS. |
| 56 | OSL Global. |
| 57 | Trigent software. |
| 58 | Nippon signalling. |
| 59 | GG tronics. |
| 60 | Efftronics. |
| 61 | Bharat Rail. |
| 62 | TATA Projects. |
| 63 | Texmaco Rail & Engineering Limited. |
| 64 | BEML. |
| 65 | Titagarh wagons. |
| 66 | ABB Group. |
| 67 | Stone India. |
| 68 | Lousisberger. |
| 69 | AM Signalling Design. |
| 70 | Mitsubishi Heavy Industries. |
| 71 | Cylus Cybersecurity Limited India. |
| 72 | Aegis Engineering System. |
| 73 | GRR Rail(UK Only). |
| 74 | Fidrox Technologies Pvt Ltd, Bengaluru. |
| 75 | Atkins, Bengaluru. |
| 76 | FEEDBACK Infra. |
| 77 | Jacobs. |
| 78 | Alten Calsoft. |
| 79 | SMEC Holdings Limited, Australia. |
| 80 | Poise Group. |
| 81 | WSP. |
| 82 | Progressive Rail(a Caterpillar Company UK Only). |
| 83 | Frauscher, Bengaluru. |
| 84 | Rail First Asset Management. |
| 85 | RGB Assurance. |
| 86 | Rio Tinto. |
| 87 | Shoal Group. |
| 88 | Strukton Rail. |
| 89 | Sydney Metro and Trains. |
| 90 | Voyants Solutions Pvt.Ltd. |
| 91 | TasRail. |
| 92 | TfNSW. |
| 93 | Torrens Connect. |
| 94 | Lendlease Engineering. |
| 95 | LTK Engineering. |
| 96 | MCLeod Rail Pty Limited. |
| 97 | Multi Civil and Rail. |
| 98 | MTM. |
| 99 | NTC. |
| 100 | ONRSR. |
| 101 | Pacific National, Australia. |
| 102 | PTV. |
| 103 | Puffing Billy. |
| 104 | Queensland Rail. |
| 105 | DPTI(SA). |
| 106 | Fortescue. |
| 107 | One Rail. |
| 108 | IRT. |
| 109 | JHG Rail. |
| 110 | JVAT Rail. |
| 111 | KBR. |
| 112 | Knorr Bremse. |
| 113 | Laing O'Rourke. |
| 114 | Abbott Risk Consulting. |
| 115 | ARC Infrastructure. |
| 116 | ARTC. |
| 117 | SV Infra, Bengaluru. |
| 118 | ATSB. |
| 119 | Aurecon. |
| 120 | Aurizon. |
| 121 | BHP. |
| 122 | DoT Victoria. |
| 123 | Downer. |
| 124 | Transdev Auckland. |
| 125 | TTG. |
| 126 | VicTRACK. |
| 127 | V/Line. |
| 128 | Yarra Trams. |
| 129 | Avinash Engineering Industry, Hydrabad. |
| 130 | G.Satish Enterprises, Secunderabad. |
| 131 | M/s Suresh Traders, Secunderabad. |
| 132 | Vineela Enterprises, Secunderabad. |
| 133 | Sai Krishna Engineer, Chennai. |
| 134 | Mrs. Madha Constructions, Bengaluru. |
| 135 | V.Satyanarayana Railway Singnalling, Bengaluru. |
| 136 | Naveen Engineering Works, Bengaluru. |
| 137 | Durga Signalling Pvt.Ltd, Kolkata. |
| 138 | Devan Industries, Chennai. |
| 139 | Venkata RamiReddy Constructions, Chennai |
| 140 | Ganapathi Engineering Works, Hubli. |
| 141 | Angelique International Limited |
| 142 | KEC International Limited. |
| 143 | Areca Embedded Systems Pvt.Ltd. |
| 144 | Kernex Microsystems. |
| 145 | HOWE Engineering Projects Pvt.Ltd, Ahmedabad. |
| 146 | RITES(Rail India Technical and Economic Service). |
| 147 | IRCON International Limited. |
| 148 | Bharat Electronics Limited. |
| 149 | Bharat Earth Movers Limited. |
| 150 | Transmashholding, Russia. |
| 151 | Stadler Rail. |
| 152 | Quadgen Wireless. |
| 153 | Statcon Energiaa. |
| 154 | Mosaic Rail Ltd, Hydrabad. |
| 155 | Asterbit Solutions and Servies Pvt.Ltd, Bengaluru. |
| 156 | Fidrov Tech Pvt.Ltd. |
| 157 | Tata Elxsi, Bengaluru. |
| 158 | HBL Power Systems Pvt.Ltd. |
| 159 | Sensedge Transportation Systems and Sol Pvt.Ltd,Bengaluru. |
| 160 | Data Technosys(Engineering) Pvt.Ltd, Lucknow. |
| 161 | Bright Power Solutions, Bengaluru. |
| 162 | Obcon SolutionPvt.Ltd, Bengaluru. |
| 163 | LGM Technologies India Pvt.Ltd. |
| 164 | Unified Signalling And Transportation Systems Pvt.Ltd, Hosur. |
| 165 | RAO Certification Centre, Bengaluru. |
| 166 | Lab to Market Innovation Pvt.Ltd. |
| 167 | ALTEN Calsoft Labs, Bengaluru. |
| 168 | SS railworks Pvt.Ltd,Hydrabad. |