Hi Robert ,
Check the following cv settings : cv2 = 3 minimum speed /start voltage
cv3=80 acceleration rate
cv4=80 deceleration rate
cv5=225 max speed
cv6=88 mid speed
What DCC controller are you using ?
Anyone reading this , if you a specific Murphy Models decoder for the 201/071 and you have a problem with it where it does not operate .
DO NOT RESET THE DECODER to factory settings by using cv8 .
You are removing the unique Murphy Models decoder mapping settings which are specific to each loco class 201 / 071 non sound/sound decoder eg cab interior lights etc .
If you have a problem with a decoder check the cvs from the manufacture web site that they correspond to your decoder .
The above cvs are from the ESU site .