BLI N&W A

[NW Modeling List]

I had a similar issue with a BLI Y6 on the rear engine. Turned out the
rubber traction tire on one side was over-sized which made the flange
depth too shallow. I replaced the driver and the problem went away. 
Gary Hoover

	-----------------------------------------From: "NW Modeling List via
NW-Modeling-List" 
To: "NW Modeling List"
Cc: "NW Modeling List"
Sent: Thursday March 16 2023 2:54:14PM
Subject: Re: BLI N&W A

 Chris,
 Thanks for helpful suggestions. I’ll let you know what I find.
 Bill

 Sent from my iPhone

 > On Mar 16, 2023, at 1:51 PM, NW Modeling List via NW-Modeling-List 
wrote:
 >
 > Hi Bill,
 > I would check spring tension on the pilot truck. Try picking up the
front of the engine by the front cylinders raising it around a half
inch above the rail. If the pilot truck does not drop down somewhat
below the level of the bottom of the front cylinders, the retainer
screw for the pilot truck is probably too tight. If I remember
correctly, there is a small spring underneath the screw for the pilot
truck. If the screw is too loose the pilot truck will be “floppy”
and not exert adequate tension. If the screw is too tight the spring
is too compressed and no downforce is exerted on the rail. I would
also check gauge on the pilot truck axle and the drivers with an NMRA
gauge. I had to adjust the spring tension on the pilot truck on one my
BLI “A’s” as well. I hope this helps.
 > Highball,
 > Chris Dalton
 > Bluefield, WV
 >
 > Sent from my iPhone
 >
 >> On Mar 16, 2023, at 7:01 AM, NW Modeling List via NW-Modeling-List
 wrote:
 >>
 >> My first time posting here. I am modeling the N&W late steam
era (mid-‘50s) with focus on coal mining region. There will never be
a diesel loco on my layout!
 >>
 >> I have an early (‘83 vintage) BLI N&W A and a later BLI A. The
“modern” A runs great. The ‘83-vintage A seems to lack
sufficient downforce on its front truck, which derails everywhere for
no reason.
 >>
 >> Has anyone else experienced this problem? Does anyone have a
suggestion for a way to increase the load (pressure) on the pilot
truck to keep it engaged with the track?
 >>
 >> Bill Demarest
 >> N&W Steam Only
 >>
 >>
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