Well, thanks everyone for your patience! I would like to now introduce you to this recording technique: the モハラジオ which uses two 100mH inductors to pick up the train's VVVF inverter (M, H, A, B, D, Metropolis, Urbos 3, Citadis 305) or chopper (T) control unit's PWM sound. It was easy for the double-decker trains and the metro (built from stainless steel), but it might be a bit hard for the light rail (built from aluminium) therefore still being worked on. The M-set and B-set haven't yet been recorded as I haven't encountered them yet.
Waratah: