The west of Paoli cat poles are 80 years old (1939) and do not need wholesale replacement. Most of the NEC structures are older by a couple of years. The NEC poles Amtrak is leaving in service as part of the NJ ET upgrade are about six years older than the Harrisburg poles. Amtrak thinks those are still serviceable, and knowing those structures reasonably well, I agree. There are lots of other Amtrak ET needs more pressing than the Paoli-Harrisburg poles. The pipe structures east of Paoli are the problem children of the ET people (under collar and inside-out corrosion), and plans are to replace them as part of the Paoli transmission project (assuming that ever happens). That will leave really old and decrepit pipe-type cat structures between Philly and Wilmington and on SEPTA's Chestnut Hill West bunch.
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II'm not sure why you think that. ET has made mention that the bases of the poles, and a lot of the components and the poles themselves are rotting away and deteriorating. This goes back to the David Gunn years. In a lot of cases, Not much has changed except there are sporadic reinforcements and replacement of the poles. It has been determined that it is better to wait for pole replacement instead of doing patchwork. Indeed, there is a pole (not base) replacement in Maryland underway. This INCLUDES the Keystone line. Additionally, a great deal of the poles in NJ are in such sad shape, the company (I can't remember if it is JCP&L or PSE&G) that pays for their lines to run from Metuchen to roughly Adams expressed concern and were making arrangements not to use them since they know they need replacement and they didn't want the costs.
As it is 2018, they may not be exactly 90 years old but they are still approaching 90 years old...with no full scale replacement on the horizon, even though there have been concerns about them for years.
But hey, I'm not on the poles. I can only go by what the people that are on them report when projects and outages are discussed. They're probably exaggerating the need.
Pennsylvania has "ponied up" lots of money for the Keystone Corridor - paying 50% share of Keystone upgrade project that started in 2006 including track and tie renewal, interlocking replacement, station reconstruction, signals, and ET upgrades. All that has resulted in a 110mph corridor, something that would not have happened without the state contribution (in excess of $70 million for the first phase alone). PennDOT is still a funding partner of the ongoing Keystone Corridor improvements. All that suggests that Pennsylvania's support of the Keystone Corridor has not been "irrelevant." I have a suspicion you know that.
If they ponied up 50% to pay for the millions and millions of dollars (that could have supported the Cardinal and many other trains) it took to shave roughly 15 minutes off the trip between PHL-HAR, who paid for the rest? Do you think PA, would have paid 100%? Will they fund 100% of the future improvements in their state? They didn't in the past.
As I stated, without support from the rest of the country (via Amtrak), the state that let their long distance train go because they didn't want to fund it, barely funds SEPTA, had to battle a few years ago to fund their state supported train (in stark contrast to VA, MA, CT, VT to name a few) and along with Amtrak, would have continued to allow the Keystone line to languish. Without the rest of the the country, the Keystone line would still still be as it was...complete with the miles and miles of stick rail that is was famous for. I also firmly believe that if the rest of the senators told Pennsylvania(or any of the NEC states besides NY) to pay the FULL costs of their service, not only would the line not improve, it would get get worse as PA balked at supporting the full costs of the 110mph service.
But, I have a sneaky suspicion you know that.
What you may not have known, is if PA didn't pony up, they were going to turn the Keystone Line into another version of the Springfield line: Single track west of Paoli with passing sidings.