8 Comment

  • It’s most likely because of the sharp turn at that point. i know i hate it.

  • I believe that’s the segment where the two tunnels are stacked on top of each other. If I recall, the stacked tunnels are prefabricated shells (similar to the Yellow Line under Potomac Park), and don’t dampen the noise as much as the concrete tunnels do.

  • On a related note, does anyone ever notice the occasional extremely high pitched squeal on the train? It is waaaay louder than the usual track noise between GA Ave and Columbia Heights. I’ve only noticed it a few times on the green line, usually between U St and GA Ave., once the train builds up to full speed, a really, really high pitched noise will start up…sounds almost like some sort of whistling effect. I last heard it about 2-3 weeks ago for a few days in a row. I haven’t heard it since. The noise is so loud that I have to cover my ears. I’ve only noticed maybe 2-3 others people ever cover their ears so it makes me think, am I one of the only people that hears the noise or are others just not bothered?

  • and it’s only bad going Petworth to CH, not the other way. that would seem to negate the turn as a culprit, right? not sure how stacked tunnels would be responsible, either.

    my question is why do the doors always take about 12-15 seconds to open once the train has stopped at CH??

  • it’s the tracks. not the boisterous urban youth

  • What you all are describing sounds just like what people said it sounded like before the Green Line derailment a year or two ago.

  • Perhaps some sort of differential braking as the train takes sharp turns at speed, or resonance of some part on the cars? It’s often way too loud inside metro cars when they’re underground anyway. I wonder if the noise level is OSHA compliant?

  • The delay in opening the doors is mainly due to the age of the rail cars.

    It’s a circuit called a time-out circuit that has to activate before the doors can either open or close…but the circuit is only activated once the train stops fully and the brakes fully engage. Then in trains of mixed-age cars and in trains of mainly older cars, it takes longer to activate the circuit to allow the doors open. (See: http://www.wmata.com/chat/archives/080505.htm “train problem”)

Comments are closed.