I have Lionel Alco RS-11 6-28528 with Oydessy Speed Control and Railsounds.
When started up in TMCC MODE, the sound functions work (motor, rev up and rev down, horn bell and coupler sounds.) Smoke on off works.
Couplers do not fire— just the sounds.
Motors do not go forward or reverse.
Substituted different R2LC 08, same result.
Have remover and reseated all three boards.