I have an old Bachmann Plus SD45 and was curious if I could use a newer SD45 motor to re-power the unit. I bought it years back and custom painted it and would like to have it be compatible with the newer Spectrum SD45's that I have. Any input here would be greatly appreciated.
Elack SD45
you can add dcc to it easy enough. follow these directions:
http://members.shaw.ca/sask.rail/dcc/tmaster/tmaster.html
they will work just as well for any split frame locomotive. i have done one sd45 this way.
with dcc you can program out any speed differences between your locomotives.