The link below provides access to my collection of the United Nations Economic Commission for Europe documents relating to the preparation of the CMR Convention (Convention on the Contract for the Carriage of Goods by Road 1956). I am grateful to the Commission for permission to permit access to these papers which should only be downloaded for personal use and not reproduced in return for payment.
https://www.dropbox.com/sh/ws1phq2ujztfvme/AABupIOur4VGQO2ynInLiRXia?dl=0
The next link provides access to a document which outlines these and the UNIDROIT documents above.
https://www.dropbox.com/s/qpbbq3rudal9eu0/CMR%20Convention%20Development%20Materials.doc?dl=0
David A Glass Carriage of Goods Law Website 