request of a rail standard

hello everybody..
I am not sure if my request is not against the rules of this site..but i need this standard:
UIC 521-1ed.
Coaches and vans, wagons, tractive stock - Clearance to be provided at vehicle extremities



https://eshop.normservis.sk/norma/uic-521-1ed--1.1.1987.html


if someone can help me, i would be so grateful..if this is against the rule,plz inform me.