|
|
| Re: PHOTOS: OLD MAIN LINE (1510182) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: PHOTOS: OLD MAIN LINE |
|
|
Posted by Sand Box John on Wed Apr 17 05:12:01 2019, in response to PHOTOS: OLD MAIN LINE, posted by Jersey Mike on Tue Apr 16 20:19:19 2019. Crossing under the Red Line via the Orange/Blue/Silver platform at Metro Center. Shame the original design didn't use islands on both levels to avoid forcing crossing passengers to congest another platform.Doing that would have required twice as many elevators, and a quarter more escalators and stairs. Digging a two track box tunnel around the 90 degree curve under the buildings north of the station from 12th Street to 13th and I Streets would have been an expensive engineering challenge. I will note that the lower level platform is 2' wider then the combined with of the two upper level platforms. Upper level platforms 18', lower platform 38'. Building both levels of Metro Center to the dimensions of the upper level of L'Enfant Plaza would have yielded upper level platforms of 21' and a lower platform of 44', (lower level platform in L'Enfant Plaza is 36' 10"). Supporting the mezzanine above the lower level like the way the mezzanine in Farragut North is supported would have eliminated all of the columns not supporting escalators. It would have been really nice had all three of the 90 degree transfer stations, Metro Center, Gallery Place and L'Enfant Plaza been built to these dimensions. John in the sand box of Maryland's eastern shore. |
|
|
|