[Sammo]

I have several loco's and am still looking for new models, however I only want locos that have the skew wound motors,
I have, over the past year or so found Hornby to be the best (my opinion) but I do not know how to tell if the newer model has this motor fitted.
Does anyone know how to tell if a loco has a skew wound motor without stripping it to find out.
I am modelling in OO gauge