Reducing noise in 4 axles N scale engines

[Biased turkey]

Having a very noisy Life-Like ( non Proto-N ) GP9-RM engine ( see a previous thread Lifelike GP9RM , started by Supaned , I found that great PDF file format document about how to reduce noise in 4 axles N scale engines at

http://trainweb.org/passengercars/Bearingblock.pdf

And the best part is that Pam at N-Scale Magazine released this article into the public domain. .

Jacques