bostontrainguy wrote: ↑Wed Jan 13, 2021 9:02 am
Can't be sure but since we are discussing the Miami Airport station electricron may have been talking about backing a train from the Miami Airport station to Hialeah which is CSX. Downtown Miami is a long way from Hialeah.
Also ironically when they rebuilt the airport station to serve Amtrak better, by building the bypass road, they disconnected an available wye that was there.
*images removed from quote for ease of reading*
I don't think that wye would bring the advantage you think it would. While the corresponding backup move would be shorter, now you have to deal with several switches, and unless they can squeeze a crossover track in there, you're limiting the tracks you can use. Then you would still have a long backup one way or the other. Let's say you bring the train straight in. Then you wye it there and pull it to Hialeah. Then what? Do you spin it around the loop so it can head forward back to the station? Which means wye-ing it again, or do you just do the long backup move? The real question though, is how fast can you shove with a tail hose and conductor at the rear? A quick Google shows speeds up to 30mph for passenger trains, what's the normal speed on this line segment? A shoving move for the 4 miles to Hialeah may not be that much slower than running forward.