Large Scale Central

Electronic Speed Control ESC unit

I read an advertisement somewhere that one of the companies that made ESC units for the RC airplane folks had developed an ESC for trains.  Now I can't find article/ad no matter how hard I look!!!!
If anybody knows who developed it, I would sure appriciate it if they would share that info.  Also if anybody has tried it I would like to know what they think of it.

Ken Johnson