The union has written to Scotland’s cabinet secretary Stephen Flynn, stating that drivers will refuse to work on the trains if CAF is awarded the contract.

It is one of five shortlisted bidders aiming to supply at least 69 new electric and battery-electric trains to operate on major routes including East Kilbride, Fife, Borders, and the Glasgow area.

CAF has been named by the United Nations Human Rights Office on its updated database of 158 companies involved in what it describes as unlawful Israeli settlements in the occupied West Bank.

It is currently building and maintaining the red and green lines of Jerusalem's new light rail system in Judea and Samaria.

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