hclee01:

Not to sound like a heathen or any thing but...
Just take whatever train you want. If the doors open to a crowded car, turn you back to the throngs and politely make space (a.k.a. push, shove) for yourself and you bag as you back into the train.

The only thing that is not acceptable is to push, bang, bump, knock passengers with you bag. However it is perfectly acceptable to clear some space for yourself using your body.

If it is really tight, you can resist those pushing back against you by placing your hand above the door once you have gotton just inside the train car.

Lets face it folks, people push their way on and off trains in Tokyo everyday. And every day their are people boarding trains with large packages or bags. Maybe not every train in every car, but it happens every day 100's of time without fail.

People on the trains in Tokyo "frown" upon those who's cell phones ring on trains as well. When it happens, those receiving the call to their best to the minimize their transgression and those the "frown" get over it. You should do the same.

I'm not saying to be a jerk about it, I'm just saying that sometimes you gotta do what you gotta do, and waiting at Narita for an hour to save a frown or two is not something worth considering IMHO.

Have fun.