As you may gather, I know very little about electrics! Humour me - if insulated rail joiners were used between the two turnouts that formed this crossover, would that solve this issue, or would the powered bogie on the loco bridge the gap? Alternatively, if I used conventional rail joiners and left the controller speed on the 'receiving' loop to zero, not increasing it until that loop had been isolated from the other by switching the points back (using insulfrog points), would that be OK? As you may be able to tell, I'm not keen on purchasing multiple transformers...😁