Rail Transportation
Rail Transportation is losing market weight. Gained weight for 1 consecutive month.
Most of this industry's losses came from a few companies.
Where did the weight change come from?
12-month contribution in universe percentage points · contributions add to the industry change
The three largest same-direction contributors explain 100% of gross losses. Opposing contributions can make an individual company’s change larger than the industry’s net change.
How has it moved through history?
Share of matched S&P 500 members
Jan 2018 – Sep 2018 · market weight (%)
Relative performance
Industry return versus ACWI · no future data shown
Is participation broad or concentrated?
Actual constituent counts at this date, not the legacy synthetic breadth proxy
This is size concentration, not contribution to the 12-month change. The attribution above measures the latter.
Evidence can disagree
Independent dimensions · no combined score or bullish/bearish verdict
Other evidence and availability
Valuation data: unavailable; shown as zero placeholder.
Attention data: unavailable; shown as zero placeholder.
Actual fund flows: unavailable. No ETF, mutual-fund or institutional flow feed is connected.
Volume / turnover: unavailable in this dataset.
Follow the contribution to individual companies
Sorted by absolute 12-month weight contribution, not investment merit
| Company | Sub-industry | Country | Universe weight | 12M contribution | 12M price return | Revisions |
|---|---|---|---|---|---|---|
| Union Pacific Corporation → UNP | Rail Transportation | United States | 0.384% | -0.216 pp | +23.9% | 0.0 |
| Norfolk Southern → NSC | Rail Transportation | United States | 0.161% | -0.085 pp | +21.4% | 0.0 |
| CSX Corporation → CSX | Rail Transportation | United States | 0.068% | -0.029 pp | +31.8% | 0.0 |
Underlying monthly industry observations
| Month | Weight | 1M change | 3M change | 6M change | 12M change | Relative return · 12M |
|---|---|---|---|---|---|---|
| Sep 2018 | 0.612% | +0.027 pp | -0.421 pp | -0.368 pp | -0.330 pp | +25.9% |
| Aug 2018 | 0.585% | -0.455 pp | -0.456 pp | -0.355 pp | -0.357 pp | +19.5% |
| Jul 2018 | 1.041% | +0.007 pp | +0.053 pp | +0.098 pp | +0.098 pp | +17.8% |
| Jun 2018 | 1.034% | -0.008 pp | +0.053 pp | +0.092 pp | +0.092 pp | +12.6% |
| May 2018 | 1.042% | +0.054 pp | +0.101 pp | +0.099 pp | +0.099 pp | +12.7% |
| Apr 2018 | 0.988% | +0.008 pp | +0.046 pp | +0.046 pp | +0.046 pp | +5.6% |
| Mar 2018 | 0.980% | +0.040 pp | +0.038 pp | +0.038 pp | +0.038 pp | +4.3% |
| Feb 2018 | 0.940% | -0.002 pp | -0.002 pp | -0.002 pp | -0.002 pp | +0.9% |
| Jan 2018 | 0.942% | +0.000 pp | +0.000 pp | +0.000 pp | +0.000 pp | +0.0% |
How are these descriptive states defined?
Gaining / losing: 12-month weight change above +0.005pp / below −0.005pp. Direction and speed are separate dimensions, not mutually exclusive recommendations.
Accelerating / slowing: compare the most recent 3M change with the preceding 3M change. Accelerating means a positive change speeds up by >0.02pp. Slowing means the magnitude of movement declines by >0.02pp. A falling industry can also slow.
Reversing: the last two 3M changes have opposite signs, outside a ±0.005pp tolerance. Persistence counts consecutive same-direction monthly changes.
Broad / concentrated: company attribution, not a market-cap concentration shortcut. Concentrated means the three largest same-direction contributors account for ≥70% of gross same-direction changes; otherwise broad requires ≥60% of constituents moving with the industry. Other cases are mixed.
Weights use matched S&P 500 members’ market-cap estimates, based on SEC-reported shares available by each month-end and monthly closing prices. Companies without a matched price or share record are omitted, so the denominator is the matched sample rather than every index member. These are not official float-adjusted S&P weights. Flow is not measured.