At an NMRA show this weekend, my friend purchased the new 2-8-2 mikado sound value dcc. It was taken to a test track to verify that it was OK. When it was put on a straight dc test track, it's lights flashed on both ends and there was a loud clicking sound coming from the speaker. The clicking and the flashing were in sinc. When the voltage was high enough, the lights were on solid and the sound started. The voltage at this point made the engine take off very fast.The test track had an old Troller unit for power. It was then taken to a display layout that had very good dc/dcc controls. On dc, the lights still flashed, but the clicking sound was gone. It still took off way too fast at the start. It was then switched to dcc and the lights came on solid and the speed was more controllable. Is this normal for a dcc engine on straight dc? Two locomotives were tested and both ran this way. Thanks in advance, Jim