I recently received the new Legacy NYC S2 Electric and noted that there is no Odyssey on/off switch and no other way to turn Odyssey off.
I run a Legacy/DCS block control layout that requires disabling Odyssey to automatically stop and start engines in relay controlled blocks. Engines with Odyssey turned on will blow through my blocks or will stop and not re-start when full voltage is restored to the block. Interestingly, all my MTH engines work flawlessly stopping and starting in the blocks.
I spoke to Angela at Lionel today about this issue. She informed me that there is now no way to turn Odyssey off and that all new Legacy engines going forward will NOT have Odyssey switches.
I hope that Lionel will reconsider their position and provide a way to turn Odyssey on and off.