Although these motors are regarded by some as a little crude they will run very well with a decent decoder - it is very important that the locomotive runs well & free before conversion - if not a good service & a commutator clean will benefit.
Make sure that you use a decoder that will dim the lights, otherwise they will look like searchlights & possibly damage the body (an alternative is to use 24v bulbs or even modify to fit LED's).
The most important step is picture h006
-cutting the link to isolate the chassis from the -ve motor brush-
you can fit a TCS M1 decoder in that spot shown by the German site
I can email you a conversion of a similar setup motor if you wish , although it is mounted upside down to that one
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