Employing an idiom that has gained remarkable popularity for cancelling plans this winter, Deputy General Manager Jeff Gonneville told board members that the new trains had been pulled "out of an abundance of caution" after engineers identified another issue with the new trains' bolster components, which lie between the floor of each car and the truck frame, which holds the train's wheels (see diagram above).
But now, the same part appears to be creating a new problem.
"It is not the same issue as we were seeing the last time, but (our engineers) also worked to come up with a retrofit - a modification for a particular part - that we are going to be doing and installing on the vehicles," said Gonneville on Monday.
"We are planning to do some testing on that part on the cars early this week with the hopes that we begin retrofitting later in the week," continued Gonnville. "We are not ready to commit when the trains will go back into service, but certainly we are optimistic that they will not be out of service as long as, or much longer than they were last time."
“It’s a structural problem,” an anonymous source from the Chinese rail industry told FactWire. “The bolster function balances the train’s weight and swing range, [therefore] cracks are dynamic, [they] can spread to the train car body with the bolster function, so the entire train car must be replaced.”
MBTA officials declined to respond directly to the FactWire report, but said that the MBTA, CRRC, and other vendors have been collaborating on a new design for the bolster components.
Gonneville assured board members that all future Orange and Red Line cars scheduled to be manufactured by CRRC would also adopt the new design.