Dutchrailnut
Conductor
The track that train 1546 derailed on had wooden ties (track 4)track 2 Has Concrete ties but was damaged by 1546's last 4 cars derailing ito path of train 1581Look at the series of pictures posted by CHamilton. Both types were in that area. One picture shows a pile of broken concrete ties.you guessed wrong on concrete ties, at location it had wooden ties.
So again the track involved in derailment had wooden ties.