SEPTA's PTC Implementation Is Still Terrible

Unlike previous generations of automatic train control, the on board PTC software has as much if not more to do with the operational impact of the safety system than fixed infrastructure like code rates and block length. In the case of ACSES, Amtrak's PTC implementation, track mounted transponders conveys data about upcoming civil speed limits, grades and positive stop points and it is up to the on board system to develop a braking curve. In theory this curve should represent the maximum braking effort the rail vehicle is capable of if tripped by the PTC system to prevent an unsafe level of overspeed. The concept of a penalty brake application exists for thus purpose as a full on emergency application requires some additional inspections. (Although I have been present when the "freight" ETMS PTC system threw my Amtrak train into emergency.) 

Four years ago I benefited from a SEPTA training run to capture two videos of how their PTC implementation functions and the braking curve was ridiculously bad. Granted I lack similar curve information for other operators, but the SEPTA engineer could stay under the curve with a very mild brake application. I got some comments on the order of "PTC is new and SEPTA will inevitably made modifications to improve the performance."  Well on my most recent winter SEPTA fan trip I lucked into another training run on the Airport Line and I can report that the system has not been changed and it still causing significant delays.

Unfortunately I was only able to capture video of the cab display unit returning from the Airport to Eastwick which had no PTC speed downgrades and therefore no demonstration of the braking curve (although I did capture a missed transponder reading). In fact my inability to get a video angle was doubly unfortunate because the braking curve is so conservative that it caused the engineer to trigger a penalty brake application just north of PHIL interlocking's southbound home signal. This is where the line speed of 45mph transitions to 30mph for the Airport Line curve just south of PHIL interlocking. (Even before ACSES this curve was protected by a 45mph Approach Medium cab signal) This meant that the on board system calculated a braking distance of about 4500 feet to slow from 45mph to 30mph.

Time for some math. The starting velocity is 66 fps and final velocity is 44fps.  From my observations the braking "curve" is linear which gives us an average speed of 55fps and thus a deceleration time of 81 seconds. This lets us solve for acceleration with a solution of 1.38fps^2 or 0.9 mphps, which is an absolutely pathetic braking rate. Even if I assume I was wrong about where the speed curve kicked in and the penalty took place just after the limits of PHIL interlocking, 2800 feet from the restriction, the resulting deceleration rate is still 1.4 mphps, less than half of the design acceleration rate of 3 mphps.

In this example we have the two bugaboos of PTC working together to sap performance on what should be a speedy trip to the airport. The first is a stacked safety margin. The older ATC system enforced a 45mph limit on approach to and around the 30mph curve. That would have been a rough ride and close to the overturn speed, but would likely be enough to prevent a derailment without getting in the way of the engineer. Today the ACSES takes the 30mph as gospel even though that figure already accounts for human error. Next, the conservative braking curve compels a speed reduction about three times farther away than would be necessary with the full braking force available. The end result is net gain of 10 seconds to traverse the same 4500 foot distance and you can see why this is a problem. 10 seconds isn't much.  It's certainly not enough for anyone to fight for or risk being blamed for if something goes wrong. unfortunately this 10 second loss happens again and again and again over the course of a run with the end result of SEPTA having to lengthen scheduled running times by an average of 4 minutes across all of its lines. Add in more small delays like low maximum speeds, long dwell times, slow terminal operations and voila, rail transport is uncompetitive with private road transport.

As you can see in the above video SEPTA cares very little about speed in general. As seen in the video about, the R1's 4-station airport terminal complex has blanked Restricted speed limit, even when approaching CP-AIRPORT JCT after passing a wayside automatic distant displaying Approach Limited. Why even bother with the wayside at that point! Prior to ACSES, SEPTA had plans to use the 4-speed cab signaling system to implement rapid transit style signaling when Rule 562 operation was installed on its Reading territory. Maybe we'll see a realization similar to NYCTA's that speed improvements, even small ones do matter. Or maybe we'll see the response to poor post-COVID ridership to be service cuts.

Remembering South Jersey's Insulator Ranch

For years, if one were driving near Atlantic City, New Jersey, perhaps taking a shortcut between the Atlantic City Expressway exit 12 and the Garden State Parkway exit 41 due to summertime congestion, one might pass something on the side of the road that might cause a momentary feeling of disbelief where one might question what they just saw.  Located at the edge of the famous New Jersey Pine Barrens in Galloway Township, the slightly less famous Insulator Ranch was chronicled in all the typical quirky attraction websites like Weird NJ and Roadside America as it sat there provoking thousands of double takes over the years. Insulator Ranch was exactly that, a ranch house with a circumferential fence-line  constructed entirely of railroad pole-line poles fully stocked with green glass insulators. 

I first stumbled upon the site in the summer of 1998 and likely passed it once or twice in the years that followed.  In the age of Google Maps I would check in periodically, confirming that it was both still there and that my mind had not been playing tricks on me in ages past. Then, just recently, a check of the updated Street View showed that while the home and property were still there, all the magic of the green glass insulators had gone. According to the reports, the creator of the insulator art piece, a one Stanley E. Hammell, had passed away at age 89 in 2012 and was followed by his wife in 2018. I am sure one could probably dig deep enough to find out what the family did with the over 10,000 green glass insulators, but surprisingly, their fate has eluded the reach of Google. 

Mr. Hammell said that he began his collection in 1985 and continued through to the early 1990's. He talks about train shows and walking various rail lines, all things I am sure he did, but none of the articles provide insight into where I am confident he obtained the bulk of his collection because its the same place that my family came away with bushel baskets of our own. The former Camden and Atlantic, aka PRSL Main Line from Lindenwold to Atlantic City.

Having once hosted the fasted scheduled trains in the world, by the 1970's the PRSL Main Line to Atlantic City was a shadow of its former self, seeing a paltry peak direction service of ~3 round trips. Long since reduced to a single track with manual block operation south of WINSLOW tower, the line had been constructed to full PRR standards with double track and cab signaling. In 1983 NJDoT threw in the towel when Conrail stopped providing commuter rail contract services. The signaling on the line was switched off and abandoned in place. This created a bit of a gold rush with my then future shop teacher making away with an entire PRR position light mast signal and a fallen pole providing my me with decades' worth of giftable green glass insulator paperweights. 

In 1985 Mr. Hammell would find this semi-abandoned rail line with 40 odd miles of green glass insulated pole line just a few miles from his front door. I am not sure what his early collecting methods would have involved, but about 5 years later the route would see a complete reconstruction with modern signaling that had no need for lineside poles. As you can see in the photo above not a single pole line pole remains. This means they were cut down in mass by a scrapper looking to recover the copper telegraph wire. This is a fairly common practice and I am convinced that a certain retiree happened to find himself at the right place at the right time to capture large numbers of the otherwise "worthless" green glass insulators that he would go on to assemble into a monumental yet underappreciated work of roadside art. 

Insulator Ranch was one of those local institutions that seemed destined to last forever until suddenly it was gone. I never got any of my own high quality photos of the installation or spoke to Mr. Hammell or even had whichever car I was in slow down or stop. I am assuming that the collection found some sort of home as a lot of 10k+ green glass insulators would be certainly worth money, but it still goes to show that institutions are run by people and people get old and die. The next time you see some unique railfan house, don't be so sure that another member of the community will step up to purchase it when the time comes.

Signals by EMD?

So I happened to be watching one of Distant Signal's recent videos on Youtube about CSX's project to signal the Brunswick Sub into a second main line track north of Waycross yard and at the 10:25 mark I noticed a new trademark logo on a square modular signal head.

In case you can't see it's the mark of Progress Rail, the division of Caterpillar that owns EMD. It turns out that Progress Rail does manufacture a limited set of railroad and grade crossing related signal equipment including a modular signal system that feels like something you'd get if a GRE D type married an L&W. 

Speaking of L&W, I'm not sure what Progress' angle is seeing that whatever scraps Safetran is leaving behind is currently gobbled up by L&W or Lindsay (formerly GE Harmon). In fact the video only shows the Progress signals on the ground with the new erected signal masts having, what else, Safetran CLS-20's. 🙄

Interlocking Tower Audio Recordings

I've featured the work of the Youtube channel Railroad Media Archives before, but in the last few weeks they have taken a page from Evan Doobell's playbook with interlocking tower audio recordings from the 1960's and 70's. As you might be aware, the ability to capture long duration video information lagged the ability to capture long duration audio information by something like 5 decades. This means that recordings of interlocking tower operations in an audio/video format wasn't really feasible until the late 1970's, at which point everyone's favorite flags had fallen and conglomerates like Conrail and Amtrak were large and in charge.  While a great deal of vintage signaling technology was in use up through the 80's, 90's and Today, radio was well established along with its attendant operating practices such as track warrant control. 

Anyway,  Railroad Media Archives has so far posted three of these tower audio recordings covering HEATH and SUMMIT towers on the joint PRR-B&O C&N (Columbus & Newark) Railroad in Central Ohio as well as HIGH ST and MOUNDS towers in Columbus, OH. 

Hopefully we'll get to hear more of these sorts of recordings. They can certainly come in handy for any time one might be otherwise inclined to listen to radio.