jgallaway81 wrote:
As for the reason Why NS would by the 4-axle units... my guess is that with as much trackage around that is restricted to four-axles, they want executive power that is capable of SYSTEM-wiode travel, NO restrictions.
It comes down to economics - the ex-CR E's 4020-4021 were from a group of 5 Amtrak extensively rebuilt in the early 80s (the pair Reading & Nothern had were out of the same group), they had 645 power assemblies and new wiring and so on. But they issue was the trucks - they're harder to get parts for and prone to cracks and fatigue issues, so I have been told. The newest E trucks were built in what, 1960? These F-units, if they have a truck problem, NS has 100's of other units with the same trucks and parts, the parts are much more widely available. So they're less expensive to maintain and repair when needed.
I'm just glad they got rid of the ugly flat-faced pilots.