Longest windows
8 nights give 4 hours or more
With a 5-minute margin, Ålsta–Norrvik is free of trains for at least 4 hours early on every Sunday morning (00:12–05:45) and on the three bus-replacement nights 24–26 November (21:38–05:17).
Train-free windows Ålsta–Norrvik, November 2026
Gaps between trains on bandel 412 that are long enough for the track renewal, read from the graphical timetable for November, and a check of the track possessions granted for weeks 45–48.
Summary
Granted possessions
1 of 5 granted possessions has trains inside it
BSP-26-4473, 17 November 01:40–03:45, overlaps the as-required freight trains 44792 and 44791 (at the section 02:28 and 02:46). Confirm with traffic control whether they will run, or apply for another window. The other four possessions are clear.
Weekday nights
No 2-hour window starts on 10 of 21 weekdays
As-required freight splits the night gap on several weekdays. On 12 November three extra timber trains close it completely, and on 18 November a track measurement train does the same.
Windows by day and month
Choose a section and the shortest window the work can use. Windows that are long enough are highlighted in the timetable. The month view shows usable hours per day. Click a train line to see how it was read from the PDF.
View
Section
Margin each side of a train
Tuesday 24 November 2026
Section Ålsta – Norrvik
0Trains through the section
0Windows long enough
0Usable time, windows starting this day
0Longest gap between trains
Regional (persontåg)
Intercity (persontåg)
Freight (godståg)
Service (tjänstetåg)
Train-free window
Granted possession
Hover a line for the train, click it to see how it was read from the PDF. Times are rounded inwards to whole minutes so a window never starts before the margin has passed.
Windows on this day
Bounded by the last train out and the next train in.
From PDF vectors to times
Train 44702
A PDF stores the line as coordinates in points (pt), measured from the bottom-left corner of the page.
time = page start + (x − 92.00) ÷ 2.90 minutes
km = 186.420 + (723.89 − y) ÷ 12.40, snapped to the nearest station row
| # | Page | x (pt) | y (pt) | Station | Time |
|---|
November 2026
Section Ålsta – Norrvik
0Days with a long enough window
0Usable hours in November
0Longest window
0Granted possessions with a train inside
More usable hours
Windows across the 24 hours
GGranted possession, clear
GGranted possession with a train inside
A night window counts on the day it starts.
Sources and method
Sources
- Grafisk tidtabell T26 Bdl 412 nov.pdfGraphical timetable, vector PDF, one set of pages per day
- Spårtider_beviljade_v45-48.xlsxGranted track possessions, weeks 45–48
- Arbetsbeskrivning_spårbyte_Ålsta-Norrvik.pdfWork method statement: at least 2 h per shift, preferably 4 h
Method
- Station rows were located from the operating point (driftplats) labels and chainage (km-tal), and the time axis from the hour grid: 2.9 pt per minute, 6 hours per page.
- Each stroked path in the PDF was read as one train run. Its vertices give the passage times, its dash pattern the train type and the nearest label the train number.
- The read times were plotted back onto the original pages, and the number of trains per page was compared with the train numbers printed on it.
- For the chosen section all passages were sorted, the margin was added on each side of every train, and gaps at least as long as the chosen minimum were kept.
- Each granted possession was compared with the passages on Ålsta–Norrvik.
Assumptions and limits
- As-required trains (behovståg) are counted as running.
- A night window counts on the day it starts. Window times are rounded inward to whole minutes.
- Times read from the graphics are accurate to about ±1 minute. Check against the official timetable and current traffic restrictions before applying for possessions.