OC Twitter reporting a train immobilized on track 1 at UOT.
What's going on, how controllers deal with this, and what to expect as a passenger.
Track 1 is the westbound track. We have switches just before Hurdman station, and switches just after UOT.
So with a train stopped at UOT, we need to use track 2 (eastbound track) for both directions between those switches.
It takes about 7 minutes for a single train to travel from the switch before HUR, service the stations, and pass the switch after UOT. This means that trains heading east need to wait 7 minutes at RID for trains heading west, and vise versa.
What happens with 11 trains on the track is that two or three trains will stack up at the stations behind the diversion, and we will release 2 trains across in each direction as the track becomes available.
The service still runs, but you get chunky headways, and the information displays get a little confusing, because the system cannot accurately predict when a train will be released across a diversion.
Your trip from BLA could look like this... Train arrives, its smooth sailing to TRE. Then, you're waiting anywhere from 5-14 minutes as trains cross the diversion. You start rolling again when the diversion opens up, and your trip crosses to track 2 for 3 stations.
From TUN, you're likely to get 2 delays, as more trains are west of the diversion than are east. You might see a delay at PIM, then again at RID because there's likely more than 2 trains ahead of you looking to cross the diversion.
These delays and diversions usually get cleared up within an hour, but the chunky headways continue until the service does a few end-to-end flips.
Those end-to-end flips fix the headway by using the dwell times at terminus stations. Essentially, your drivers give up their breaks to fix the headways over an hour or more.
At the single-track stations, you need to pay attention to where your train just came from.
Everyone, east and west, are on the same platform at HUR, LEE, and UOT. If your train came from downtown, it's going east!
The moral of the story here... it's delayed, not stopped. Trains still run, it'll take you as much as 20 extra minutes to go end-to-end, but it's running!
Posted 4 years agoby Shane Seguin