France's secretary of state for transport, Frederic Cuvillier, called it a "tragically comical", "mind-boggling" mix-up, blaming a lack of coordination between France's two state rail bodies, the SNCF and the RFF.
Cuvillier said he has asked the chiefs of both entities to launch internal investigations into the costly gaffe, saying: "We have to identify how these decisions were made."
The Societe Nationale des Chemins de Fer (SNCF) and the Reseau Ferre de France (RFF), acknowledged the embarrassing situation in a joint statement on Wednesday after it was revealed by satirical weekly Le Canard Enchaine.
According to the Canard Enchaine, the SNCF drew up the specifications for the new-generation trains, including the carriage width.
"But the SNCF's clever engineers forgot to check on the reality on the ground," where the space between platforms varies between stations, it said.
The problem affects 182 regional trains supplied by French manufacturer Alstom and 159 from Canada's Bombardier, due to come into service by 2016.
So far, 300 station platforms have been adapted since work began in 2013, with the project set for completion in 2016.
"It's a bit like buying a Ferrari that you want to fit into your garage, but then realising your garage isn't quite Ferrari-sized, because up until now you didn't own a Ferrari," it offered by way of analogy.
The mix-up drew strong condemnation across the political spectrum, leading to clumsy efforts at damage control by the top rail brass.
RFF boss Jacques Rapoport gave his personal guarantee that ticket prices would not be affected.
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