O the humanity!

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ICG/SOU

HO & O (3-rail) trainman
So, I had my first trainwreck today. For some reason (not clear to me) my Weaver GP38-2 with TMCC went full throttle and uncontrollable. I couldn't get to the surge protector switch, so I waited until the locomotive was passing me and I picked it up off the tracks.

Well, I didn't think about the cars still coupled. Fortunately, only 3 fell not quite 3 feet to the laminate floor. Damage:

1 Lionel PS2CD 4427cuft covered hopper, one slightly bent stirrup, 2 bent trucks (where the hole is for the bolster, the sheet metal bent) and 2 roller bearing caps. Since the car has mostly metal, it survived of damage. Luckily, I had some spare trucks and was able to put new ones on. The old ones are salvageable, but will not be returned to service. I am amazed how robust the car is.

1 Weaver 50' Single Door box car, only damage is the shell separated from the floor. Nothing that some glue couldn't fix.

1 Atlas Trainman ACF 50' Box car with a broken bolster (it's plastic). I've superglued it, but it looks like I'll be calling Atlas for a replacement if it doesn't hold.

So, what makes TMCC go nuts and uncontrollable? It seems to work now, and there wasn't any derailing equipment to cause a short. Luckily my current layout is a loop, but was thinking about remaking it into a switching module, and if the loco can go nuts like this again, then I'll have to rethink that setup.
 
So, I had my first trainwreck today. For some reason (not clear to me) my Weaver GP38-2 with TMCC went full throttle and uncontrollable. I couldn't get to the surge protector switch, so I waited until the locomotive was passing me and I picked it up off the tracks.

Well, I didn't think about the cars still coupled. Fortunately, only 3 fell not quite 3 feet to the laminate floor. Damage:

1 Lionel PS2CD 4427cuft covered hopper, one slightly bent stirrup, 2 bent trucks (where the hole is for the bolster, the sheet metal bent) and 2 roller bearing caps. Since the car has mostly metal, it survived of damage. Luckily, I had some spare trucks and was able to put new ones on. The old ones are salvageable, but will not be returned to service. I am amazed how robust the car is.

1 Weaver 50' Single Door box car, only damage is the shell separated from the floor. Nothing that some glue couldn't fix.

1 Atlas Trainman ACF 50' Box car with a broken bolster (it's plastic). I've superglued it, but it looks like I'll be calling Atlas for a replacement if it doesn't hold.

So, what makes TMCC go nuts and uncontrollable? It seems to work now, and there wasn't any derailing equipment to cause a short. Luckily my current layout is a loop, but was thinking about remaking it into a switching module, and if the loco can go nuts like this again, then I'll have to rethink that setup.

Your problem is in CV29. Turn off the DC mode. It's a commonn problem for loco's to take off if the mode is turned on.
The most common setting for CV29 is 34.
Here's a CV29 calculator:
http://www.dccinstalled.com/product_p/stx-810132.htm
 


ICG/SOU
Wow, you sure were lucky! It sounds like the GP-38 lost the TMCC signal “went conventional”.
If I were you I would check that the antenna in the engine is routed correctly, and has a good connection.

I had that happen to me with a GG1. The pantographs on my GG1 are an extension of the internal antenna wires.
I had just lubed /reassembled it, and failed to put the Pantographs back on (test run only).
The engine went about 10 feet down the track lost the signal and went full throttle on me. In my case I hit the kill button on my cab. Sure did scare me

Hope this helps:)
 
Foolishly, I didn't think of the halt button on the CAB. I just thought that the train had made two loops and didn't know how much longer it would go before stuff started derailing.

One thing I'll need to do is make a master kill switch more accessible to where I was.
 




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