by Vincent
The reason the Cascades Talgos are operated under a waiver is that the FRA changed the crashworthiness standards after the Talgos were ordered by Amtrak and WSDOT. At the time the trains were ordered, they were FRA crashworthy. But by the time they were put in service, the FRA had changed the crashworthiness standards, leaving the Talgos non-compliant and Amtrak had to gain a waiver from the FRA to continue operations. That's why you always see a heavyweight locomotive or NPCU on each end of the trains, plus there must be an unoccupied baggage car and unoccupied power car at each end of the trainset. The unoccupied cars are supposedly the crush zone that will protect the passenger-occupied cars from damage in the event of a head end or tail end collision. The WI Talgos appear to have enough strength in the cab car and the end car to meet FRA requirements.
I hope that HEP is available from either the cab car or the locomotive. Looking at the technical drawing it appears that the cab car is connected semi-permanently to the trainset while the end car is fitted with a knuckle type coupler for connecting to the locomotive. Hopefully, if the generator in the cab car fails, the trainset will still have a backup HEP source. My understanding is that, most of the time, the Cascades operate using HEP from the locomotive and only use the on-board generator as a back-up.
If you have time to search for it, the waiver application and comments provided by Talgo to the FRA are online somewhere. It's interesting to read the comments and responses, one quickly realizes that Europeans and Americans are approaching railroad safety issues from completely different universes.
I hope that HEP is available from either the cab car or the locomotive. Looking at the technical drawing it appears that the cab car is connected semi-permanently to the trainset while the end car is fitted with a knuckle type coupler for connecting to the locomotive. Hopefully, if the generator in the cab car fails, the trainset will still have a backup HEP source. My understanding is that, most of the time, the Cascades operate using HEP from the locomotive and only use the on-board generator as a back-up.
If you have time to search for it, the waiver application and comments provided by Talgo to the FRA are online somewhere. It's interesting to read the comments and responses, one quickly realizes that Europeans and Americans are approaching railroad safety issues from completely different universes.