Electric train sound

Why does it make that sound?

[nbauers]

You can hear the motor power switching circuits. To avoid wheel spin, excessive current in the motors and toppled grannies, the power has to be increased gradually. As the pitch increases, so does the motor current. The current is pulsed on and off at a high rate. As the pitch rises, the on-time increases and so does the motor power.

[MrBnsftrain]

Electric trains sound so cool when they leave the station!

[Cosmos_Beatz]

man, i just love that idle humming sound on electric trains

[LukaPOfficiel]

Ah yes, the RABe 514 acceleration is a sound I never forget:)

[PaulsDMVRailroadsandAviation]

The electric motors have these things called "inverters" which switch the current's flowing direction. These are alternating current (AC) motors; direct current (DC) motors don't usually have inverters

[SamT]

It sounds like an electrostar on drugs lmao

[benjaminbonelli]

The green line of the MBTA has this sound it sounds low pitch

[THEKINGOFLORDS]

Sounds like victora line
Spooling sound sounds like new skoda metro warszawa

[DynamicMat_WT]

sounds like Hong Kong IKK train Sp1900

[sansoveio]

It´s an IGBT Electric engine and this same engine is slowly carrying the energy to be able to take advantage of it better!

[kdlehel]

asincronious motors sound accelerating.

[THEKINGOFLORDS]

Hold your camera up next time.(No offence)