NBN ISO 21106:2021

This document specifies a calculation method of recyclability and recoverability rates for rolling stock.
The method defined in this document applies to the design of new rolling stock. However, it can be
applied to other existing rolling stock depending on available information. If calculation of recyclability
or recoverability is applied to separate parts and/or products used in rolling stock and a specific
calculation standard or method exists for the part and/or product, such standard or method can be
applied, if relevant.
This calculation method is applicable regardless of any geographical concern.
This calculation method is applicable to any stage of life cycle of rolling stock. The calculated
recyclability and recoverability rates are valid at the point of delivering the rolling stock products or
equipment. Future recycling technologies or predicted trends with respect to the recycling industry
are excluded from any consideration for this calculation method.
This calculation method considers the four main treatment processes, which are reuse, recycling,
energy recovery and disposal (Figure 1). Process losses of recycling are treated in the disposal stage.
The residue substances of the energy recovery stage (mostly ash and slag) and the residue of the
incineration process of the disposal stage are most likely landfilled.
Figure 1 — End-of-life treatment
The application of this calculation method considers the rolling stock or equipment as delivered. Spare
parts and/or maintenance parts necessary to keep the rolling stock in service over the entire life cycle,
INTERNATIONAL STANDARD ISO 21106:2019(E)
© ISO 2019 – All rights reserved 1

ISO 21106:2019(E)
e.g. brake pads, are not taken into account. Also, infrastructure systems like stations, electrification,
signal and control units, etc. are excluded from the calculation (Figure 2).
Figure 2 — Scope of the calculation