What is the meaning of TRD in railway?

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Tags

1. #supply
2. #significant
3. #traction
4. #group
5. #through
6. #using
7. #tower
8. #locomotive
9. #running
10. #electric
11. #staff
12. #department
13. #power
14. #distribution
15. #going
16. #equipment
17. #overhead
18. #wagon
19. #duties
20. #train
21. #maintenance
22. #electrical