1. ABB Ltd.
2. Alstom SA
3. Atkins by SNC-Lavalin Group
4. Cisco Systems Inc.
5. DXC Technology Company
6. Fujitsu Limited
7. Hitachi
Ltd.
8. Huawei Technologies Co. Ltd.
9. International Business Machines Corporation
10. Nokia Corporation
11. RailPod Inc.
12. Siemens AG
13. Telefonaktiebolaget LM Ericsson
14. Thales Group
15. Toshiba Corporation