lionel atlantic speed problems, 6-28071

John, your top speed somehow got set to what it is.  Follow what is posted below and you should unlock it and regain control.  Do this with the Odyssey switch on.

1. While the locomotive is in neutral, turn your controller up to the maximum power (no
more than 19 volts), wait one second, then press and hold the horn button.
2. While holding the HORN button, slowly reduce the track voltage to approximately one-third
or one-half of the full power.
3. Release the HORN button.
4. Move the locomotive  in forward OR reverse. The locomotive  is now out of speed
control mode.

Thanks Marty.  I don't remember seeing anything labeled as an odyssey switch but I will check it out tonight 

John Z

Some Odyssey equipped locomotives didn't have the switch.

Your locomotive is an Odyssey equipped locomotive.  I get to see your issue a few times each year.

Follow the same steps as described above even if there is no Odyssey switch. In locos without a switch, you can turn Odyssey on and off using your transformer.

You are aware of what Odyssey is and how it works, right?

Good point Jim.  Speed control can be turned on using your transformer in conventional mode.

Jim R. posted:

Follow the same steps as described above even if there is no Odyssey switch. In locos without a switch, you can turn Odyssey on and off using your transformer.

You are aware of what Odyssey is and how it works, right?

No, I am not all familiar with that system.  This is my only lionel engine that isn't purely conventional.   

Okay,  first of all thank you all as I now have speed control again! Now I have a different problem.  The engine takes off at very low voltage, which is no big deal, but now the whistle button causes the e unit to cycle into neutral when traveling forward. I am using an mth z 750 transformer. 

Any thoughts on how to keep this from happening at low voltage in conventional mode? 

Open the engine up and re seat the R2LC board and let us know what you have.  Are you saying the whistle issue is only at low voltage?  Put your tender on the tracks without the engine and hit the whistle and bell and let us know what you are seeing.

Do you have another transformer you could try this with?