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_IV_ principle for the full treatment of details connected with Rolling Stock of E l e c t r i c R a i l w a y s , reference must be made to V o l u m e I I , Electrical Engineering. T h e method adopted i n dealing with the technicalities of R a i l w a y work, w h i c h h a s been fully explained i n the Preface to Volume V (Railway Construction a n d Operation), h a s been i n a similar manner the standard adopted in the compilation of the present volume. Again, on the completion of the present volume, the E d i t o r h a s to thank h i s professional colleagues i n all countries for him, by the ready and cordial support given which support alone the many m e a n s of difficulties inherent to the work have been overcome. A s was tbe case w i t h Volume V , active assistance h a s been received from the " V e r e i n fur E i s e n b a h n k u n d e " , the and "Verein also from Deutscher many Maschineningenieure", men and firms the of to "Ministere des chemins de fer du royaume de Belgique" prominent world-wide renown. T h e E d i t o r i s again indebted and takes this Dipl -Ing. Mr. Aug. B o s h a r t oppor- tunity of tendering to h i m h i s sincere thanks for the m a n n e r i n w h i c h the material h a s been put together. Further, he tenders h i s t h a n k s to, among others, the following gentlemen associated with h i m i n the work, E n g i n e e r s Messrs. E d g a r C h a r l i e r - D e s m e t , Contin, Tavolato took the Railways. I n the verification of a great many of the exDobrotworsky, Victor Euelens, Pietro Douglas J . C r u i c k s h a n k , W e t s c h e s l a w Benvenuto underElectric and Alexander T r e t t l e r , work in the chapter as well as to to Dipl.-Ing. Mr. W . W e i s s b a c h of B e r l i n who referring pressions, several j o u r n e y s abroad have been necessitated i n order to get i n touch personally with individual collaborators. T h e s e journeys, combined with the carrying out of the ideas and suggestions of professional men have occasioned more than ordinary material sacri-