i havent found it until now, if you find it, please leave a note here. as you surely know there are some parts of it in books about brockmann, but thats not what you want.

if i get some free time (after a stressy period ending end of april), i’ll try to call the SBB (swiss federal railways in german) and ask if they’d know any place i could still find it (archives, whatever). but probably they wont have anything.