Observatory · observe first

Follow the allocation change

Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.

Historical time machine

Historical observation

20182026

Universe›Industrials›Rail Transportation›Rail Transportation

1 · Sector

Weight and 12M allocation change

Information Technology41.9%+7.32 pp Energy2.5%+0.19 pp Consumer Discretionary11.8%-0.20 pp Materials2.0%-0.21 pp Communication Services2.4%-0.32 pp Real Estate2.0%-0.41 pp Utilities2.4%-0.43 pp Industrials9.6%-0.50 pp Health Care9.7%-1.47 pp Consumer Staples5.7%-1.52 pp Financials9.8%-2.46 pp

2 · Industry

Inside Industrials

Construction Machinery & Heavy Transportation Equipment1.03%+0.37 pp Construction & Engineering0.38%+0.24 pp Aerospace & Defense2.35%-0.23 pp Human Resource & Employment Services0.21%-0.21 pp Industrial Machinery & Supplies & Components0.80%-0.20 pp Environmental & Facilities Services0.33%-0.19 pp Electrical Components & Equipment0.80%+0.19 pp Heavy Electrical Equipment0.48%+0.17 pp Diversified Support Services0.20%-0.16 pp Passenger Ground Transportation0.25%-0.15 pp Building Products0.49%-0.13 pp Research & Consulting Services0.07%-0.10 pp Industrial Conglomerates0.52%-0.07 pp Agricultural & Farm Machinery0.25%-0.06 pp Trading Companies & Distributors0.20%+0.04 pp Data Processing & Outsourced Services0.03%-0.03 pp Air Freight & Logistics0.34%+0.03 pp Rail Transportation0.53%-0.03 pp Passenger Airlines0.19%+0.02 pp Cargo Ground Transportation0.13%+0.02 pp

3 · Sub-industry

Inside Rail Transportation

Rail Transportation0.53%-0.026 pp

Concentrated

Most of this industry's losses came from a few companies.

View all contributions →

Rail Transportation · weight

0.53%

Industry change · 12M

-0.03 pp

Rail Transportation · contribution

-0.026 pp

Company participation

100%

of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

May 2026 · sorted by absolute contribution to 12-month change

Company	Country	Market cap	Universe weight	3M contribution	12M contribution	12M price return	Above 6M weight average
Union Pacific Corporation → UNP	United States	$155.9bn	0.270%	+0.054 pp	-0.030 pp	+21.2%	Yes
CSX Corporation → CSX	United States	$84.1bn	0.146%	+0.037 pp	+0.011 pp	+45.3%	Yes
Norfolk Southern → NSC	United States	$68.5bn	0.119%	+0.022 pp	-0.008 pp	+25.7%	Yes

Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.