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**roysmith**I took the 3:58 New Haven line out of GCT this afternoon. It was kind of strange that it was a long train (I didn't count cars, but looked like at least 10, maybe more), and mostly empty. They could have had half the number of cars, and it still would have been mostly empty. Which got me thinking about how trains get put together.

I assume the railroad has a good idea of how many people ride each train, and how many cars they'll need for each trip. Do they assemble each train with the right number of cars for that particular trip? Or do they have a bunch of trains pre-made up with 6, 8, 10, or whatever cars, and they stay together like that for the whole day, or for many days at a time?

I assume the railroad has a good idea of how many people ride each train, and how many cars they'll need for each trip. Do they assemble each train with the right number of cars for that particular trip? Or do they have a bunch of trains pre-made up with 6, 8, 10, or whatever cars, and they stay together like that for the whole day, or for many days at a time?