Quote:
Originally Posted by TonyTone
Would it really be that difficult to regauge the EL if they just redid the portion from 49th to 69th in the early 2000’s? Im sure im about to simplify this but during that process couldn’t they just put the tracks on the same gauge as the BSL while they were redoing that portion for example? & then do the rest down the line all the way up to frankford? .
|
It’s not that simple.
Every mile of El trackage west of Millbourne is what is called “direct fixation.” This means that the rails are held in by clips and tie plates, which are in turn held in by fasteners directly into the concrete structure. This is slightly different in some underground sections, where you have wooden ties laid in insets in the roadbed that are in turn fixed in place. Re-gauging the entire line to 4’8.5” from 5’2.25” would require tearing up all of this concrete and pouring completely new plinths the entire length of the El. This is expensive and incredibly difficult to justify.
They didn’t re-gauge it in the early 2000s when the section from 46th westward was redone because that would have also required doing the rest of the line, which SEPTA did not have the money for (or really, the care for).
Re-gauging the track also doesn’t account for what is honestly the bigger problem: the
loading gauge. For those uninformed, the loading gauge refers to the clearances along the line that restrict car dimensions (platforms, ceilings, etc). The cut-and-cover method used to construct the line downtown from 24th to 2nd resulted in its incredibly low ceilings. There’s only like 3 feet between the top of Market and the ceiling of the El in some sections. In addition, the platforms are rather close to the tracks, which is no doubt related to the non-standard track gauge the El uses.
Compare this again to the Broad Street Line and Ridge Spur. These were built after the El in the 1920s. By then, they had learned some lessons on subway construction, and built the line with wide and tall loading gauges. This is why the BSL (and, consequentially, PATCO) feel so much roomier than the El.