^ I don't know much about the different types (except what you just told me!), but wouldn't it be more efficient to either order the new cars with the similar couple as the existing ones, or retrofit the old ones to be able to pair with the new ones? There isn't much that you can do about the AC vs. DC issue though.
And then we'll have the low-floor trains for the SE line that won't be able to run anywhere on the existing system. It sort of seems that we're getting a variety of incompatible types of trains. Wouldn't it be more efficient to try and standardize things a little bit?
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