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Bob - overhang is dependent on the radius - for the 72 diameter it is just at 3" from outside of the rail to farthest overhang on ends of the loco.

Jim

Jim,

Understood.  That said, I think your GG would have hit some trackside accessories located next to the track on more than one of the SGMA Trainfest layouts I managed between 2012 and 2017.  Worse, as Kirk points out it might hit other Standard Gauge trains on SGMA's STD87 mainline

For example, checkout 3:20 into this video of SGMA at Trainfest 2014:  https://www.youtube.com/watch?v=x7DIBFLi1zo

Bob

 

 

 

Last edited by navy.seal

One of my most postponed projects is to build an overhang/underhang gauge we could use during SGMA (Standard Gauge Module Association) events to measure these specifications for every piece of rolling stock that is run at our shows. The late great Arno Baars collected some information of this type, but there is much more to be done.

One thing is certain, the original STD72 and STD84 curves on SGMA modules were too close together (6-3/16" center-to-center) to run many of the larger Standard Gauge trains.  The current SGMA modules have STD7t 2 and STD87 curves (7-1/4" center-to-center), and we haven't seen any contacts occur.

However, we haven't run one of Jim's GG1s past another so far as I know! (I think we also need to to try two 4-6-6-4 steam locos.)

Kirk

www.standardgaugetrack.com

@SGMA1 posted:

One of my most postponed projects is to build an overhang/underhang gauge we could use during SGMA (Standard Gauge Module Association) events to measure these specifications for every piece of rolling stock that is run at our shows. The late great Arno Baars collected some information of this type, but there is much more to be done.

One thing is certain, the original STD72 and STD84 curves on SGMA modules were too close together (6-3/16" center-to-center) to run many of the larger Standard Gauge trains.  The current SGMA modules have STD7t 2 and STD87 curves (7-1/4" center-to-center), and we haven't seen any contacts occur.

However, we haven't run one of Jim's GG1s past another so far as I know! (I think we also need to to try two 4-6-6-4 steam locos.)

Kirk

www.standardgaugetrack.com

Kirk,

Yes!  Those GG1 and 4-6-6-4 tests need to be run and their overhang/underhang data collected!

If my memory serves me, which of late has been less and less often, documenting overhang/underhang of all Standard Gauge locomotives and cars was also dear to my heart.  As I recall I pushed for posting this data on the SGMA website under the theory that it would promote membership in SGMA nationwide.  More visits to our website, more members, more modules, more SGMA layouts at train shows, more FUN!

I still think SGMA should post the data we have collected to date on our website!

Bob Nelson

PS.  Jim is in the process of building me a Milwaukee Road Mallet (2-6-6-2) on which data will also need to be collected once it is finished.  I envision running the Mallet pulling a long consist of 200 series iron ore cars as the Milwaukee Road did in Michigan's U.P. and in northern Minnesota.  

Last edited by navy.seal

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