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Thread: Old atlas/kato U25b

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    Default Old atlas/kato U25b

    Hello everyone,I'm new here so be gentle,I have an old atlas/kato u25b and was wondering if I could convert it to dcc. I was doing some research on it and found spookshow's article on them on the net (great help) and possibly sound as well. without major machining? I'm just getting back into N scale after messing around with Fn3 and On30.and would like to know if it's worth it or if I should just use it as a paperweight? Thanks,choo choo.

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    Personally, I wouldn’t attempt sound in one, but the installation of a TCS CN decoder isn’t bad. It requires a very small amount of frame modification.

    See: http://tcsdcc.com/sites/default/file...on%20Guide.pdf

    Paul
    For decoder installation and JMRI services, please visit http://www.bentraildigital.com
    For n-scale intermodal information, please visit http://nscaleintermodal.com

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    @Choo Choo charlie

    Moose bid you hearty welcome to the greatest wee n-scale forum on the interweb!

    Might not be worth it as a drop-in doesn't seem to be made for it -- NOT sure of this though ... Moose do quick check on TCS website and find AMD4 decoder as a drop-in for the Atlas U25B, BUT based on Mark's spookshow website photos, Moose believes will NOT fit your early model. Moose think that perhaps you could do some milling of the frame to fit TCS CN or CN-GP, BUT not sure...

    Perhaps someone on nSn has done an early model U25B? @gamitzu
    ~ Moose (Co-founder of the Mt. Tahoma & Pacific Railroad, located some where in the Pacific Northwest)

    "Beware the Train of Thought that Carries no Freight..."

    "Reading is for morons who can't understand pictures..."

    Click Here to See Moose's Layout Thread

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    Icon7 U25b

    Thanks for the info and the link, it looks very do-able.

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    I would only do it if the loco ran good on DC to start with. If it doesn't run really well on DC, you are wasting your time and money to upgrade it. Some of those older Atlas/Kato units didn't have very good pickups. Also, check to see if there is a MTL coupler conversion kit available. Some of them are hard to find.
    Daniel Dawson

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    Default U25b

    It's a great little runner,but definitely needs real couplers!.gives me something to tinker with when I'm not doing benchwork

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    Are the regular Atlas Classic line U25s with the 645-X001 lightboard in them convertible to DCC, or would they put up a big fight?

    Also, does anyone know how to make it easier to get the shell off of a U25B, especially the sill assembly? Any tabs on the frame that you carefully file down?
    Director of Operations of the Kettle River Railway

    See photos of the original owner's layout here:
    https://m.flickr.com/#/photos/about-...7603977732928/

    It sounded like a good idea at the time... too bad the caboose wasn't in on the plan.

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    Quote Originally Posted by Mill-Bay View Post
    Are the regular Atlas Classic line U25s with the 645-X001 lightboard in them convertible to DCC, or would they put up a big fight?


    If your chassis looks like this, then your best bet will be to use one of TCS's CN or CN/GP decoders.
    It's a bit of trick to install, slight milling (files or dremel tools will suffice along with some minor soldering)
    (image from spookshows page)

    If your chassis looks like this then you'll need to get a replacement board from one of several companies.
    Remove or loosen the frame screws, pop the existing board out and drop the new DCC board in place and re-assemble.



    Quote Originally Posted by Mill-Bay View Post
    Also, does anyone know how to make it easier to get the shell off of a U25B, especially the sill assembly? Any tabs on the frame that you carefully file down?
    I've carefully inserted an exacto blade between the sill and frame and gently twisted the blade until the sill popped over the tabs.
    Be careful if you file any of the tabs down, make sure they'll still hold the sill in place.
    Last edited by Allen H.; 24th Jun 2019 at 05:51 PM.
    The Little Rock Line blog


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    So that would be the DN163A0 from digitrax?
    Director of Operations of the Kettle River Railway

    See photos of the original owner's layout here:
    https://m.flickr.com/#/photos/about-...7603977732928/

    It sounded like a good idea at the time... too bad the caboose wasn't in on the plan.

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    Quote Originally Posted by Mill-Bay View Post
    So that would be the DN163A0 from digitrax?
    Yepper, that would do the trick. You could see what TCS and NCE have that is comparable.

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    Does anyone have a lead on a good source for a few relatively cheap DN163A0 decoders?
    Director of Operations of the Kettle River Railway

    See photos of the original owner's layout here:
    https://m.flickr.com/#/photos/about-...7603977732928/

    It sounded like a good idea at the time... too bad the caboose wasn't in on the plan.

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