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Author Topic: Atlas 90 Ton Hopper Question???  (Read 3166 times)

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Kisatchie

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Atlas 90 Ton Hopper Question???
« on: April 27, 2014, 06:46:13 PM »
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I may be getting some Atlas 90 ton Western Maryland hoppers. They ride on bettendorf trucks. Since I model 1971, I was wondering if I should change the trucks to Atlas 70 ton trucks?

Thanks for any suggestions.


Hmm... I'm biting my
tongue... I'm biting it
real hard...

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Robbman

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Re: Atlas 90 Ton Hopper Question???
« Reply #1 on: April 27, 2014, 06:53:30 PM »
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The Atlas car is supposed to be on 100T trucks, but when it was tooled correct 100T trucks didn't exist, so it was tooled to accept 70T trucks and called a 90T hopper.
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Mark5

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Re: Atlas 90 Ton Hopper Question???
« Reply #2 on: April 27, 2014, 07:31:44 PM »
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This car should have roller bearing trucks. Like Robbman said when these were tooled the only trucks Atlas had were Bettendorfs. Since the 1990s or so, Atlas has been selling these with 70 ton roller bearing trucks (they should be 100 ton trucks but see Robbman's post above).

Mark
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Kisatchie

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Re: Atlas 90 Ton Hopper Question???
« Reply #3 on: April 27, 2014, 07:36:46 PM »
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Quote from: Robbman on April 27, 2014, 06:53:30 PM
The Atlas car is supposed to be on 100T trucks, but when it was tooled correct 100T trucks didn't exist, so it was tooled to accept 70T trucks and called a 90T hopper.

Oh! That complicates things. I suppose I'll just put on Atlas 70 ton trucks, since lots of my other 90 ton hoppers have that type truck.


Hmm... maybe there's
something interesting on
TV...




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Two scientists create a teleportation ray, and they try it out on a cricket. They put the cricket on one of the two teleportation pads in the room, and they turn the ray on.
The cricket jumps across the room onto the other pad.
"It works! It works!"

crrcoal

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Re: Atlas 90 Ton Hopper Question???
« Reply #4 on: April 27, 2014, 08:28:39 PM »
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I've got a bunch of these cars. Eventually I will be doing the daunting task of converting to body mount couplers. When I do that, is there a correct 100 ton truck that is recommended?
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Kisatchie

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Re: Atlas 90 Ton Hopper Question???
« Reply #5 on: April 27, 2014, 08:41:38 PM »
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Quote from: crrcoal on April 27, 2014, 08:28:39 PM
I've got a bunch of these cars. Eventually I will be doing the daunting task of converting to body mount couplers. When I do that, is there a correct 100 ton truck that is recommended?

I tried the Atlas 100 ton trucks on one of my 90 ton hoppers. The 36" wheels scrape on the underframe and the car can only be dragged along the track. I'm not sure anyone's 100 ton trucks would work properly on these cars, unless you did some filing of the underframes.


Hmm... sound like too
much work for me...

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Two scientists create a teleportation ray, and they try it out on a cricket. They put the cricket on one of the two teleportation pads in the room, and they turn the ray on.
The cricket jumps across the room onto the other pad.
"It works! It works!"

nsbob

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Re: Atlas 90 Ton Hopper Question???
« Reply #6 on: April 27, 2014, 08:58:34 PM »
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My personal preference is the BLMA 100 ton trucks if you are going to use body mount couplers.  BLMA also makes 70 ton trucks if you are modeling the pre 100 ton truck era.  I haven't installed the BLMA tucks on any hoppers yet but they do lower the height so they may not work without modifying the underframe.  One solution may be to replace the 36 inch wheels with 33 inch wheels.  Hopefully someone has experimented with these and can give you a recommendation.
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Mark5

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Re: Atlas 90 Ton Hopper Question???
« Reply #7 on: April 27, 2014, 09:20:26 PM »
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Some experimentation I did with the BLMA 100 ton trucks:

http://therailwire.net/forum/index.php?topic=20824.0
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Kisatchie

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Re: Atlas 90 Ton Hopper Question???
« Reply #8 on: April 27, 2014, 09:41:41 PM »
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Quote from: Mark5 on April 27, 2014, 09:20:26 PM
Some experimentation I did with the BLMA 100 ton trucks:

http://therailwire.net/forum/index.php?topic=20824.0

That was interesting reading. I'm not about to move the bolsters on 150+ Atlas hoppers, and I don't have a drill press to drill slightly off-center bolster pin holes.

Yep, it's looking more and more like the cars I might be buying are going to get Atlas 70 ton trucks.


Hmm... maybe I can
convince Kiz to buy all
my arch bar trucks...

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Two scientists create a teleportation ray, and they try it out on a cricket. They put the cricket on one of the two teleportation pads in the room, and they turn the ray on.
The cricket jumps across the room onto the other pad.
"It works! It works!"

Mark5

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Re: Atlas 90 Ton Hopper Question???
« Reply #9 on: April 27, 2014, 09:50:26 PM »
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Quote from: Kisatchie on April 27, 2014, 09:41:41 PM
That was interesting reading. I'm not about to move the bolsters on 150+ Atlas hoppers, and I don't have a drill press to drill slightly off-center bolster pin holes.

Yep, it's looking more and more like the cars I might be buying are going to get Atlas 70 ton trucks.



You don't have to move the bolsters ...  ;)
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bbussey

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Re: Atlas 90 Ton Hopper Question???
« Reply #10 on: April 27, 2014, 11:23:58 PM »
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The Atlas 100-ton truck frames fitted with FVM 36" wheelsets should work in the Atlas 90-ton/100-ton hopper.  But using BLMA 100-ton trucks will lower the car to the correct ride height.
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Bryan Busséy
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crrcoal

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Re: Atlas 90 Ton Hopper Question???
« Reply #11 on: April 28, 2014, 08:29:31 AM »
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So the easiest and possibly best way to do this (with no modifications other than a shim) is to use BLMA 100 ton trucks with 33 ton wheels, correct?
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bbussey

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Re: Atlas 90 Ton Hopper Question???
« Reply #12 on: April 28, 2014, 09:44:14 AM »
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No.  As shown in Mark's thread referenced above, the best option is BLMA's 100-ton ASF Ride Control trucks with the included 36" wheels and no shim.  Unlike the Micro-Trains truck frames and earlier non-metal-wheel Atlas truck frames, the BLMA truck frames are the correct scale width and should pivot under the stirrups.

Another option of moving the trucks outward is: fill the existing bolster hole with styrene; drill and tap #00-90 holes at the proper position; cut the pins off Micro-Trains bolster pins, drill and tap #00-90 holes; insert 3/8" #00-90 brass screws into the bolster pins; and screw the trucks into place.  I've used this method numerous times to move truck centers easily.  One notable example is when I lowered Micro-Trains depressed center flatcars and had to significantly push the truck centers outward to a prototypical location, to both clear the well and to eliminate the "trolley car" appearance.


« Last Edit: April 28, 2014, 09:46:40 AM by bbussey »
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Bryan Busséy
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MichaelWinicki

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Re: Atlas 90 Ton Hopper Question???
« Reply #13 on: April 28, 2014, 09:48:51 AM »
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Wish BLMA would come out with a bulk pack of their 70 & 100 ton trucks.
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Atlas Paul

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Re: Atlas 90 Ton Hopper Question???
« Reply #14 on: April 28, 2014, 10:07:14 AM »
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Back when these cars were tooled, EVERY Atlas car came with friction bearing trucks.

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