|Queensland Rail's Next Generation Rollingstock|
The potential bad news, is that the trains will continue to have only 2 sets of doors per car side. This is disappointing given the trend on other suburban commuter rail systems (including Paris RER, San Francisco's BART, and in Melbourne) to increase the number of doors per car side. The more sets of doors per car side, allows for faster passenger flows getting on and off the train, and thus allows for shorter station dwell times. Shorter station dwell times results in being able to run trains more frequently and more reliably. Shorter station dwell times also result in faster journey times.
The reasons for not having 3 sets of doors per car side on the NGR is unknown. Platform edge doors on Cross River Rail/Brisbane Underground could have been a factor, but as long as the 1st and 3rd doors on the NGR trains matched the position of the 1st and 2nd doors on the current trains, this would have been a non-issue. Japan is even testing platform edge doors that can automatically adjust their position for different trains!
Another reason may have been to simply decrease (or not increase) maintenance costs. 3 sets of doors per car side require a 50% increase in maintenance than 2 sets of door per car side. This may increase recurring costs. However, these decreased costs will leave a legacy of longer station dwell times for the next 40 years. Good or bad decision?