Original: They are known as '' bodysnatchers '' , or '' Zombies '' to enthusiasts , by virtue of the fact that the shell ( body ) of the Class 47 has been stripped , rewired and re-engined and as '' GM '' s due to them being '' genetically modified '' with General Motors equipment .
Simplified: They are known as '' bodysnatchers '' , or '' Zombies '' to enthusiasts , because the shell ( body ) of the class 47 has been stripped , rewired and re-engined .