explainer · HACKER NEWS RECOMMENDATION
CBTC: Communications-Based Train Control
mtainfo · 2 HN recommenders · 2 recommendation months
Recommended by 2 Hacker News commenters across 2 months (2015–2022).
SignalTube analysis
Among 93 other explainer videos tagged Transit, cities & urban planning, the mean is 3.3 distinct HN recommenders. This video has 2 distinct HN recommenders, below that mean. Recommendations span 2 distinct months; the peer average is 3.1 months. This is a data-derived comparison, not a human review or quality rating.
33% of its 6 labeled comments are marked as recommendations or strong recommendations. HN mention years are 2015–2022; those years describe discussion history, not upload date. Its verified runtime is 9 minutes 26 seconds. YouTube lists its publication date as 2015-07-20.
- Channel / speaker
- mtainfo
- Verified runtime
- 9m 26s
- YouTube upload date
- 2015-07-20
- Hacker News mention years
- 2015–2022
SAME TOPIC AND FORMAT
Compare with related videos
The comparison cohort uses other explainer videos in Transit, cities & urban planning. “Shared recommenders” counts HN users who recommended both videos in the source graph.
| Video | HN recommenders | Recommendation months | Positive label share | Shared recommenders | Runtime | Upload date |
|---|---|---|---|---|---|---|
| CBTC: Communications-Based Train ControlCurrent video | 2 | 2 | 33% | — | 9m 26s | 2015-07-20 |
| Why American Cities Are Broke - The Growth Ponzi Scheme [ST03]explainer · Not Just Bikes | 14 | 10 | 70% | No recorded overlap | 9m 39s | 2021-01-11 |
| Stroads are Ugly, Expensive, and Dangerous (and they're everywhere) [ST05]explainer · Not Just Bikes | 12 | 11 | 60% | No recorded overlap | 18m 14s | 2021-04-26 |
| These Stupid Trucks are Literally Killing Usexplainer · Not Just Bikes | 11 | 5 | 55% | No recorded overlap | 35m 7s | 2023-03-06 |
THREE SOURCE-BASED CONTEXT POINTS
Why Hacker News recommends it
Each note combines the dataset’s stance label and short rationale; comment bodies are not reproduced. Open the HN source for the original discussion.
The archive classifies this as a contextual reference in “How Many Tracks Do Train Stations Need?”. Its short rationale: Shows the 1930s mechanical signals being replaced by CBTC.
The archive classifies this as a recommendation in “Why New York Subway Lines Are Missing Countdown Clocks (2015)”. Its short rationale: Explains interlocks in antique subway signal systems.
The archive classifies this as a contextual reference in “Proposal to fix NYC’s subway and broader transit system expected to cost $19B”. Its short rationale: the source snapshot has no short rationale for this mention.