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Hello everyone! Just joined here and getting back into model railroading. Looking forward to participating in the discussions on this forum.

I'm designing a back-and-forth sequence as follows: Train begins on siding, proceeds through a switch onto a section of the main line, which includes a grade, then finishes by going through another switch and dead-ending onto a siding. The main-line trains will travel up this same grade, so I'm planning to isolate the grade as a block and wire a dedicated throttle (with the reproduction ZW master throttle setting) so that I have the ability to set a slightly higher voltage going up the grade (so the mainline maintains speed).

I've managed to workout a conventional, display-style wiring scheme with some Dallee products (in conventional mode). As I mentioned, the mainline trains will always travel up the grade, but the back-and-forth train will go both up and down the grade and reverse after a short neutral on the sidings described above.

Here's my question: Would a Lionel engine with Legacy speed control (in conventional mode) maintain the same speed when entering the grade block (which has a higher throttle setting)? Or will there be a spike? Any other ideas on ways to maintain the back-and-forth speed with this setup?

Thanks for your thoughts and ideas. Let me know if you need any more details.

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Relay could swap in the bonus voltage.  Relay is set when back-forth engine starts its cycle at bottom.  Relay is reset when engine reaches upper siding.  If no "reset" signal is available up top, a timer-relay that runs for whatever time it takes to climb the grade would automatically reset to clear the bonus voltage.

If you have mainline engine that don't have conventional speed-control, they too might benefit from the bonus voltage.  In this case a 10 cent magnet under the engine could trigger a 50 cent reed switch in the track bed before the grade.  This would be an alternate trigger source to the bonus voltage relay.

Here's my question: Would a Lionel engine with Legacy speed control (in conventional mode) maintain the same speed when entering the grade block (which has a higher throttle setting)? Or will there be a spike? Any other ideas on ways to maintain the back-and-forth speed with this setup?

No. There would be a delay in the speed change by the Odyssey cruise control when it sensed a higher voltage in conventional operation, but, it would increase in speed. There would also be a delay in slowing when it left the higher voltage block.

Stan's idea is the best solution to give a non-cruise engine the bonus voltage. The other engines would not have the trigger magnet.

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