In the following table, revenues are broken down into a combination of transport type and geographic area.
3. Depreciation, amortisation and impairments
For information on impairments of non-current assets, please refer to note 14.
5. Own capitalised production
The own capitalised production in 2020 of €137 million (2019: €147 million) refers mainly to the refurbishment of trains.
6. Subcontracted work and other external costs
The costs of subcontracted work are the costs relating to the execution of assignments by third parties that are not covered by the other items in this category.
7. Infrastructure levies and franchise fees
The infrastructure levies and franchise fees for the railways in the United Kingdom include an amount of €25 million (2019: €18 million) relating to the mechanism of Central London Employment (CLE).
8. Other operating expenses
‘Other operating expenses’ include insurance, accommodation costs, costs of fixtures and fittings, auditor’s fees, marketing costs, maintenance costs for operating assets and additions to provisions.
9. Income tax
Corporation tax is calculated based on the applicable tax rates in the Netherlands, the United Kingdom and Germany, taking into account the tax rules that give rise to permanent differences between the determination of the profit for commercial