Don't take this as more than vague speculation but:
- I don't think the wear is anywhere near as significant on most of it - wider radius curves + far less volume on much of it.
It's a LOT fewer train movements per day. A real lot. The tracks on the CR network aren't taking a pounding every 6-12 minutes each direction. And we really don't have much freight at all. All of the freight tonnage for the region is wadded up into a few monster trains per day spread across the outer Worcester Line, outer Fitchburg Line, and outer Haverhill Line...then just small-to-modest size single locals per day on portions of 5 other lines.
- I believe Keolis does a lot of the work/a lot of the work is done through Keolis, their name is on a lot of work announcements. Are they facing the same staffing issues the MBTA is? I feel like I haven't seen reports of CR trains getting canceled for lack of crews - while that doesn't mean their track crews are also well staffed, it's notably different from the MBTA.
They are not facing the same staffing issues. The hiring pool for passenger RR crews includes the freight RR world, so the T and Amtrak liberally hire away from CSX, the former Pan Am, Norfolk Southern, the Genessee & Wyoming lines, and other area shortlines. The T has had particular success of late hiring away jumping Pan Am crewmembers ahead of their job reassignments with CSX and G&W (ex-Pan Am and Pan Am Southern territory is hurting real real bad for crews right now because of the mass exodus to passenger-land). It's a very competitive job market in New England, and they right now are feasting on it because of the recent upheavals (mergers, labor strife) in the freight world.
I don't know how the shop positions have been faring lately. There was an acute shortage a few years ago, but Keolis is a large global employer so they may have been on top of it.
- I certainly don't have a number, but I feel like there have been a lot of different trackwork projects over the past 10-15 years or so all over the place and like I've seen lots of different announcements go by regarding them. (plus basically every line getting a new/majorly upgraded signal system) They also often seem to be at larger scales than we often see for subway track work - for example, the Haverhill Line got about 30 track-miles replaced in 2021 and you can find a project in of that kind of scope in many years.
Don't forget the Fitchburg Line improvements project within the last decade, major work (rail distressing to allow 80 MPH speeds) on the outer Worcester Line, complete Old Colony tie replacement, major replacement/rehab projects at two Rockburyport drawbridges. Plus all the signal work for the PTC mandate, which renewed a lot of the lines that were most oft-plagued by signal issues.
Then there's the rolling stock. The HSP-46 locomotive order completed in the last 9 years, the F40PH-3C rebuild program now winding its way to completion (all of the non-rebuilds are gone), repairs of a bunch of out-of-service GP40MC's. Then the bi-level fleet getting mid-life overhauled, and the troubled first order of Rotem coaches getting warranty-repaired enough that their reliability is now good. Now the second-batch Rotem order replacing all the single-level cab cars. Loco and cab car uptime (the ones that count for running the train because they have all the controls and signal hardware) hasn't been this good in decades. The only really dodgy rolling stock left on the roster are some of the old single-level trailers...and trailers don't fail often enough to KO a whole train schedule because of their overall simplicity (the worst you'll get is HVAC issues like a hot car, or jammed doors). So the Purple Line fleet has basically never been in this good a shape in 50 years, which is something you CAN'T say for rapid transit who are running rolling ruins (Red), continuing lemons (Green Type 8's), or buggy new tech (Orange).
And it's a lot easier to do maintenance on CR since ridership on weekends is so low it's NBD if you take it out of service to do work then.
Somewhat true. The PTC signal work involved a lot of weekend bustitutions. But most of the time the lighter weekend schedules simply allow for exclusive single-tracking, so you can have 1 track down for the count for an entire weekend without it causing any schedule disruptions. And, on a lot of lines, single-tracking on the weeknight off-peak at no peril to schedules.
If we implement full Regional Rail frequencies some of that extra flexibility may go away, but right now the starkness of the peak vs. off-peak divide makes for very large maintenance windows where single-track ops are possible.
Inner Haverhill line is closing for a month starting Saturday…
That's the last line segment on the whole system that still needs cab signals installed. And it's last because the old ABS signal system is ancient and needs complete cabling replacement. The only other line that was in as decayed a signal state as Reading was the Rockport Branch, and that too had liberal amounts of bustitution (some of it wadded up with the Gloucester drawbridge replacement).