Welcome to BVEStation.
That's how its supposed to sound but can you perfect the R142a motor sound Fan Railer?
The R142A is more difficult to work with simply because of the structure of the sounds that need to be combined. To be honest, I thought that the sounds that came with SIR's NTT trains were pretty decent.
Right and another thing, you know that background sound the R160 uses? Implement that to the R142. See how that comes out.