More RER NG double-deck EMUs ordered
https://www.railwaygazette.com/traction-and-rolling-stock/more-rer-ng-double-deck-emus-ordered/64017.article
I wonder why RER is stick to double-deck EMUs, despite the fact that it increases time for boarding and alighting due to the limited number of doors.
I guess double decker train is not suitable for commuter rails, which connect suburb with downtown.
