MetroNorthTweet,&nbsp;the official Twitter account of MTA Metro-North Railroad, engaged in argument on Twitter today with a&nbsp;Connecticut commuter who complained&nbsp;of being stuck on a&nbsp;stalled train&nbsp;at Grand Central Station with a screaming baby onboard. To all you commuters out there who&amp;#8217;ve been similarly irked by a crying child on a Metro-North train, the official response from MetroNorthTweet [...]