With an updated model of rider flows thanks to better data from WMATA, we can better understand crowding on Metrorail. Last week, We Love DC analyzed Metro crowding. They argued that Red Line riders have it worst because the Red Line carries 48% more riders than the Orange Line. However, the overall number of riders on the line as a whole is not enough to accurately measure congestion.

The proportion of commuters in each direction matters as well. For instance, if we have two equivalent lines, each with the same ridership, and 90% of Line A’s AM peak trips are inbound while only 60% of Line B’s are, Line A will be more congested. It would still be more congested even if Line B had 10% more riders.

Another factor that must be considered is the spreading of trips along the line. Not every rider starts at a suburban terminal and rides to downtown. Some start at suburban terminals and ride to suburban office centers, while others start in urban neighborhoods and ride into or through downtown. The Red Line is the longest line and has more stations than the Orange Line, so more riders are to be expected.

Finally, the amount of rail service impacts congestion. The Red Line does not share trackage with any other rail line. This means that the number of trains per hour is higher on the Red Line than it is on the Orange Line, which shares tracks with the Blue Line.

With these factors in mind, let’s look at rider volumes. The link with the most riders in the system, according to my analysis, is the inbound Blue/Orange shared segment between Rosslyn and Foggy Bottom, which carries 44,719 people between opening and 9:30 AM. In second place is the next link inbound, from Foggy Bottom to Farragut West, carrying 41,137 riders during that period. In third place comes the Red Line, with 31,773 trips from Dupont Circle to Farragut North. This means that the most used section of track of the Red Line carries only 70% as many riders as the busiest section of track on the Blue and Orange Lines.

But the real crux of the issue becomes clear at the Rosslyn junction point. At Rosslyn, 65% of inbound riders are on the Orange Line, but only 60% of trains are on the Orange Line. That means that passenger demand slightly outstrips the supply of railcars at that point. And the inbound track between Court House and Rosslyn is the 7th busiest in the system during the AM Peak.

Top 20 Metro Link Volumes (AM Peak)

Numbers represent one-way volumes (from → to)

FromToVolume
ORBLRosslynFoggy Bottom44,719
ORBLFoggy BottomFarragut West41,137
RDDupont CircleFarragut North31,773
ORBLFarragut WestMcPherson Sq31,448
RDWoodley ParkDupont Circle31,156
RDGallery PlaceMetro Center31,002
ORCourt HouseRosslyn30,992
RDUnion StationJudiciary Sq30,694
RDCleveland ParkWoodley Park29,143
RDJudiciary SqGallery Place28,685
ORClarendonCourt House28,353
ORBLL’Enfant PlazaSmithsonian28,290
YLBLPentagon CityPentagon27,235
RDVan NessCleveland Park27,163
ORVirginia SqClarendon26,917
ORBLSmithsonianFederal Triangle26,347
ORBLMcPherson SqMetro Center26,264
ORBLEastern MarketCapitol South25,944
ORBLCapitol SouthFederal Center SW25,855
ORBLMetro CenterMcPherson Sq25,422

With the most riders, the Red Line certainly faces crowding issues, although the crowding might not be as acute as it is on other lines due to ridership patterns.

The Red Line essentially operates as two overlapping services during rush hours. One service runs the full length of the line, from Shady Grove to Glenmont and back. The other service only runs between Grosvenor and Silver Spring.

At the Shady Grove end of the line, trip volumes on the link between Shady Grove and Rockville (in that direction) are just under one-third of the volume of the highest Glenmont-bound link, between Dupont Circle and Farragut North. The Shady Grove-Rockville link’s volume is roughly half of the Grosvenor-Medical Center link. That link is just over 60% of the Dupont-Farragut link. Ridership increases by about one-quarter from the White Flint-Grosvenor link to the Grosvenor-Medical Center link.

On the other side of the Red Line, trains leaving Glenmont for Shady Grove travel on a link whose volume is about 14% of those of the most heavily-traveled link, the one between Gallery Place and Metro Center. The Glenmont-Wheaton link is about one-third the volume of the Silver Spring-Takoma link. Ridership increases by over 70% between the Forest Glen-Silver Spring link and the Silver Spring-Takoma link. Based on these numbers, the case for Silver Spring short-turns is fairly clear cut – almost twice as many inbound trips are made south of Silver Spring as they are on the busiest inbound link between Glenmont and Silver Spring.

Analysis of the other lines is not as easy since they share track with other colors downtown and in Alexandria. I’ll let you compare links for yourself below.

Note: combined line segments reflect the total ridership on that segment, not just the riders on a particular color train. For example, link C2, track 1 carries 31,448 riders overall during the AM Peak on both the Blue and Orange Lines, not each individually.

Red Line
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Track 1Track 2
Shady Grove
10,400A14902
12,686A131,554
14,650A122,031
15,473A112,674
19,243A102,872
18,953A94,795
21,320A86,811
23,608A77,933
24,817A69,529
27,163A510,223
29,143A410,086
31,156A310,238
31,772A214,785
24,772A123,293
19,132B131,002
19,739B228,685
15,019B330,694
6,145B424,686
4,888B524,635
4,434B622,456
3,363B721,321
3,753B817,692
2,996B914,359
672B108,422
557B116,676
209B124,244
Glenmont
Orange Line
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Track 1Track 2
Vienna
9,978K8732
12,924K71,442
19,627K62,560
22,174K52,724
25,390K45,386
26,917K36,096
28,353K26,544
30,992K17,448
44,719C411,581
41,137C315,524
31,448C220,896
26,264C125,422
21,739D123,495
16,992D226,347
13,269D328,299
11,738D425,340
8,489D525,855
3,717D625,944
3,033D724,009
2,977D822,297
1,948D911,993
1,409D1010,934
1,223D119,978
1,133D128,950
1,046D137,155
New Carrollton
Blue Line
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Track 1Track 2
Franconia-Springfield
6,861J2460
9,287J1772
18,291C113,999
20,451C104.390
20,773C95,467
22,764C810,058
27,235C711,391
17,134C64,873
17,016C55,007
44,719C411,581
41,137C315,524
31,448C220,896
26,264C125,422
21,739D123,495
16,992D226,347
13,269D328,299
11,738D425,340
8,489D525,855
3,717D625,944
3,033D724,009
2,977D822,297
1,008G19,812
861G28,231
763G36,936
544G44,654
410G53,550
Largo Town Center

Yellow Line
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Track 1Track 2
Huntington
6,648C13441
7,024C121,163
18,291C113,999
20,451C104.390
20,773C95,467
22,764C810,058
27,235C711,391
12,810L19,403
22,496F217,202
18,311F118,487
5,537E117,385
Mt Vernon Sq
Green Line
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Track 1Track 2
Branch Ave
5,060F10481
9,089F91,454
11,015F81,616
15,208F71,978
16,524F62,197
19,715F53,253
19,780F46,851
20,963F37,273
22,496F217,202
18,311F118,487
5,537E117,385
4,974E216,796
4,456E315,989
3,802E414,656
3,494E512,054
3,359E610,680
2,111E710,704
2,029E88,778
1,413E96,801
588E104,725
Greenbelt

Note: All figures referenced in this post refer only to the AM Peak period (opening-9:30AM).

Tagged: transit, wmata

Matt Johnson has lived in the Washington area since 2007. He has a Master’s in Planning from the University of Maryland and a BS in Public Policy from Georgia Tech. He lives in Dupont Circle. He’s a member of the American Institute of Certified Planners, and is an employee of the Montgomery County Department of Transportation. His views are his own and do not represent those of his employer.