Baltimore got a light rail line in the 1990s. It runs north south from Hunt Valley to Glen Burnie. I can only assume that this light rail line was part of a more integral system that involved more lines that never got off the ground. Since its opening in 1993 the light rail has had modest expansions and improvements including double tracking to decrease commuting times. Also, the light rail branches out twice, once to Penn Station and the other to BWI. It appears that the additional lines were a thing of the past.
This is where the yellow line comes in. It allows the existing light rail to resume its job of going from Hunt Valley to Glen Burnie. The yellow line will run from the Dorsey MARC Station at the Howard/Anne Arundel County line to Towson. It will remedy the branches of the existing light rail or "blue line" by stoppin at both BWI and Penn Station. It will parallel to the blue line for a while before branching out to Calvert St. and eventually Greenmount Avenue/York Road where it ends at Towson Town Centre. Noow here's your new Yellow Line. As usual it will be tunneled light rail past the Camden Yards Stop. If this is successful maybe this can be extended to Columbia but that's a long way off.
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