The inventories of maintenance materials consist of raw materials and other materials for the production and maintenance of finished and semi-finished products for the maintenance centres.
17. Trade and other receivables
Trade and other receivables includes an amount of €3 million (2018: €8 million) relating to ProRail and the Dutch central government.
18. Assets and liabilities held for sale
On 2 October 2018, the group resolved to dispose of the company DISA Assets Ltd and as from that date ceased to depreciate the assets in the company. The sale was completed in the course of 2019.
19. Cash and cash equivalents
The cash and bank balances are at the free disposal of the company, with the exception of €134 million (31 December 2018: €155 million).
20. Accruals and deferred income
Accruals and deferred income as at 31 December 2019 amounted to €32 million (31 December 2018: €42 million).
21. Trade and other payables
Trade and other payables includes an amount of €6 million (2018: €9 million) relating to ProRail and the Dutch central government.