(erielack) Erie / Lima Trailing Trucks

[Rich Young <ryoungceo_@_yahoo.com>]

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TTPhoto_1.jpg (image/jpeg, 718x559 108893 bytes, BF: 3.69 ppb)
TTPhoto_2.jpg (image/jpeg, 716x561 105949 bytes, BF: 3.79 ppb)
TTPhoto3.jpg (image/jpeg, 720x490 47226 bytes, BF: 7.47 ppb)
TTPhoto_4.jpg (image/jpeg, 720x499 39636 bytes, BF: 9.06 ppb)
TTPhoto_5.jpg (image/jpeg, 720x435 157997 bytes, BF: 1.98 ppb)

  Here are some photos of a Lima TT being built for an
order od Erie Berks. Which order I dunno ,as the
negative info did not specify. Also as a notes

 Commonwealth was almost entirely owned by General
Steel Casting and was the patent owners of the "Delta"
 one piece trailing truck ( both 2 and 4 wheel
versions) and cast bed frames, pilots, draft gear
amongst  other things.

Advisory Mechanical Committee Standards bulletins
discuss the almost double the amount of stay bolt
breakage / replacement in the two classes of Lima berk
vs. the other two classes.  discussed was the in the
bulletin are the lack of throat sheet support with the
Lima Truck placing a greater weight in the backhead
sheet supports and large virtually unsupported
firebox.

On paper the Erie Berks had impressive numbers but the
locomotives factor of adhesion being somewhere around
3.75 made them slippery starters and prime canidates
for the boosters. TE don't mean squat if you can't put
it to the rails. The Erie berks in retrospect had to
much piston. 

Also the Lima Built berks did not ave fully equalized
spring rigging the engine truck and main drivers were
all equlaized , but the springs were connected to the
frames after the #4 driver, thus making the locomotive
sprung  like a consol with an isolated weight bearing
truck attached.  It must have been a fun day at the
shop shimming one of these to get the axle loading
correct. 

Photo 1 & 2 are views front and rear of the same truck
notable eceptions  between the two are the placement
of the roller bearers on the rollers. Also note in the
rear view shot the cast riser with the Slide Plate
attached for the Franklin Radial Buffer the height was
such so that it was brought up to mate with all other
tenders. And the draw bar set up was standard AAR.

3,4,5 are detail shots 

 

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