NOTE: An earlier version of this article may have implied that the fault was with the yaw dampers themselves. However, in the statement below, Northern has clarified that it believes the fault to lie in the mounting system, not the actual dampers. If this inaccuracy caused any concern to the damper manufacturer, Rail Insider apologies wholeheartedly.
Train operator Northern has withdrawn 22 trains from its 100-strong fleet of Class 195 (diesel) and 331 (electric) trains.
A spokesperson for Northern said: “A fault has been identified on some of the new fleet of trains built by CAF and operated by Northern.
“The fault is affecting the mounting of the yaw dampers (a system designed to reduce swaying motion in the carriage) and has resulted in 22 trains being removed from service while the issue is investigated.
“Northern is now working closely with CAF to determine the cause of the fault and to fix the issue. The remaining 78 trains in Northern’s CAF fleet have been fully checked and are operating as normal. The units still in passenger service will be regularly checked as part of the ongoing engineering process.”
The spokesperson added: “At present, the temporary removal of the 22 trains, is not causing any impact on Northern’s timetabled services.”