Railway Transformer Market Size, Share, and Industry Analysis By Transformer Type (Traction Transformers, Auxiliary Transformers, Converter Transformers, and Rectifier Transformers), By Rolling Stock (Electric Locomotives, Metro & Rapid Transit Trains, High-Speed Trains, and Others), By Mounting Position (Underframe Mounted, Roof Mounted, and Machine Room Mounted), By Cooling Type (Oil-Cooled, Air-Cooled, and Dry-Type), By Voltage Range (Below 15 kV, 15–25 kV, and Above 25 kV), and Regional Forecast 2026-2034