TMCC LATCH-UP ISSUES WITH SPEED

Hi Ray

if the engines have  Odyssey speed control shut it off. Then try them and see if they run better  

Thanks

alex 

put both engines on the track about a foot apart.  run the engines like this and see if one catches up to the other or of one runs away.

Do both of these engines have speed control?  If so, what boards do they have?  They could be geared different, and if they use the TAS EOB, you could change the tach tape to match the speed a bit closer.

Another thing to be aware of is that TMCC really had issues doing a lash-up with any locomotives that aren't the same and weren't produced at the same time.  Even then it was luck of the draw.

The locomotives do not have to be perfectly matched in speed. As long as the "faster" one is not slipping its wheels when coupled to the "slower" one, just run 'em! The faster locomotive will just pull slightly harder on the train than the slower one, that's all.

If they both have cruise control and are not fairly closely matched, it's going to be a problem.  For TMCC without cruise, you can get away with fairly wide variations in individual speeds.

Thanks for all the answers and suggestions. Will have to do a little more research and testing later today. Both engines have Cruise and are from Atlas. The RS1 is from 2003 I believe, not certain on the RS3. 

RAY

Pretty sure that 2003 would be the TAS EOB setup.  You can "tweak" it's speed with a custom tach tape on the flywheel, it would be in about 4-5% increments as you add or subtract one stripe.

There's also this statement in the EOB documentation.  Once you get them close, this capability may help.  However, if the speeds are widely different, I think you need to get them a bit closer before you depend on this.

EOB incorporates a new technology that we refer to as “Torquemaster”.
Torquemaster is essentially a bell curve. This bell curve is what helps EOB perform so
smoothly. What Torquemaster basically equates to is a “leeway” which allows the cruise
a + or – 5% difference in the speed step. For instance, you have a lash-up with an
Odyssey equipped loco and the EOB is set for the 32-speed step mode. The Odyssey loco
runs just a hair faster than EOB at the first step. EOB will not drag or pull the Odyssey
loco, but instead will work in conjunction with it to be a more effective puller. This
means that the coil couplers will be tight between the locos and there will be no fighting
between the two locomotives. This also means that the EOB may slow just slightly
heading up a grade, or speed up just slightly, down a grade (it won’t be anything you will
detect easily), but this is the Torquemaster working. Through extensive testing we have
found that EOB works best with the Torquemaster than without it, which is why we
incorporated the feature. Torquemaster cannot be turned off, as it is incorporated in the
software. Torquemaster is not in use for the Cruise Off mode.