I used reverse loop modules on my G scale garden line extensively with no problems wahtsoever.
However when i installed them on an 0n30 line i found that problems were caused byt Bachmann Lighted passenger cars, as they collected power form 'one side' on 1 truck and 'the other side on the 2nd truck, thus the rail gap was crossed at passed at 'different times' so to speak, this caused 'confusuion' to the reverse loop module which then failed to work correctly.
Elimination of the passenger car would immediately stop the problem, but we modified the power collection arrangement on hte passenger cars which cured the problem!
However when i installed them on an 0n30 line i found that problems were caused byt Bachmann Lighted passenger cars, as they collected power form 'one side' on 1 truck and 'the other side on the 2nd truck, thus the rail gap was crossed at passed at 'different times' so to speak, this caused 'confusuion' to the reverse loop module which then failed to work correctly.
Elimination of the passenger car would immediately stop the problem, but we modified the power collection arrangement on hte passenger cars which cured the problem!