The trains are bound for Scotland
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New Turbostar trains being built by Derby-based train maker Bombardier will not be delivered to Scotland on time.
ScotRail ordered eight of the trains for its peak time service between Edinburgh and Glasgow, but only four will be completed by the January deadline.
The company said its seat supplier went into administration, causing delays.
Bombardier has since bought out the troubled supplier.
Neil Harvey, from Bombardier, said: "Our team are working flat out on making sure the seats get delivered as quickly as possible, get fitted as quickly as possible and the trains are accepted and sent straight up to Scotland."
ScotRail managing director Peter Cotton: "We are extremely disappointed that the manufacturer is not now in a position to let us have sufficient new trains in the agreed time frame.
"Our passengers will be disappointed too."