Thanks--

  I have just received a new Consolidation--it is a great model by the way--and I have to turn the throttle on the power pack to about half way before the locomotive begins to move and then it jerks and takes off at a pretty good clip--I can then reduce the voltage and it will run fine at a slower speed--and then when stopping it does not seem to slow down much before coming to a sudden stop??  I have been running an Anniversery locomotive on this same track and with the same power pack and did not encounter any of these problems--Have also ran an LGB locomotive on the track and with the same power pack with no such problems--Is this normal or do you think there might be a motor problem??
Thank you