The problem with a parallel line on Lindell or Forest Park is in headways. I personally love riding the system without use of schedule between Forest Park and Downtown, knowing that even late at night the headways are fairly reasonable. Granted, the addition of WestPort AND Florissant branches could mean that a parallel line would have just as frequent overlapping service, that is two lines running on each of the two hypothetical central-corridor alignments, instead of a cumulative four on today's existing alignment. However, the expansion of the system to new branches will only increase demand at existing stations. One need only look at how Cross County has greatly increased overall system ridership, including more crowded Lambert trains.
Fortunately, the existing central-corridor alignment has room for additional tracks between Taylor and 20th, and again between 14th and 7th. Even other places could be widened but added cost, like between Union Station and Civic Center with retaining walls, although Metro already owns the property along the tracks there.
The current Vandeventer bridge is even three-tracks wide. However, this bridge is slated for a near-future replacement. And whether it's to speed construction and thereby minimize service disruption, or just save on costs, I think the new bridge will only be two-tracks wide. Thinking long-term, I'd go ahead and build only a two-track bridge today, but leave room to someday build perhaps even another parallel two-track bridge in the future, as the Forest Park to Downtown (and into East STL) corridor will easily see more and more trains in its future.
Fortunately, the existing central-corridor alignment has room for additional tracks between Taylor and 20th, and again between 14th and 7th. Even other places could be widened but added cost, like between Union Station and Civic Center with retaining walls, although Metro already owns the property along the tracks there.
The current Vandeventer bridge is even three-tracks wide. However, this bridge is slated for a near-future replacement. And whether it's to speed construction and thereby minimize service disruption, or just save on costs, I think the new bridge will only be two-tracks wide. Thinking long-term, I'd go ahead and build only a two-track bridge today, but leave room to someday build perhaps even another parallel two-track bridge in the future, as the Forest Park to Downtown (and into East STL) corridor will easily see more and more trains in its future.







