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In a recent City Desk poll of the city’s worst bus lines, one in particular got a whole lot of attention: The 42, which runs from Mount Pleasant to downtown via Adams Morgan and Dupont Circle.

Looks like the 42’s about to get a bastard cousin.

Blogger Connetiquette Ave discovers through his eagle eyes that Metro has posted signs for a new 43 line, though no information about the route has been published in public fora, including its new Web site.

So he made like a reporter and called Metro and found out that, yes indeed, a 43 line will be in place starting Dec. 28. Here’s the skinny:

It will be a weekday rush hour only service, between 750am and 915am (meaning it will only run Southbound). About 1/2 of the buses currently designated as 42s will henceforth be badged as 43s. It will run between Mount Pleasant and Farragut Square. It seems to me that the 43 will just be the 42 buses that currently run between MtP and FSq – so there will be no service increases or reductions.