Scores are relative 0–100 marks within this atlas. Use them to browse, not as an engineering spec.
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Quick answers
Which local authority or corridor rules matter for this type?
Start with the local lens: type approval, operator licences and the hubs named on this page — not a single global checklist.
Is this a buying guide?
No. Tool-Lifes /vehicles is an educational atlas. It explains history, systems and culture without affiliate rankings.
Are the scores official?
No. The six scores are relative editorial 0–100 marks across the twenty-four types on this site.
Where do the photos come from?
Lead images resolve from Wikimedia Commons via Wikipedia titles on the English masters, with licences recorded on the credits page.
Why metric units?
Metric is the default. Regional notes (US customary, local brand culture) appear in culture and market chapters.
How is this different from a wiki article?
Each type gets seven fixed-depth chapters, comparable scores and cross-type labs — structured for browsing, not a single freeform page.
Every Tram is a negotiated stack of structure, energy conversion, control and human interfaces under weather and regulation.
The systems, meters and hotspots below are type-level engineering — manufacturers vary; load paths and failure modes do not.
Systems
Low-floor LRV body
100%-low-floor designs use small wheels or hub motors to keep aisle height at platform level.
Overhead trolley or APS
Pantograph/trolley pole picks 600–750 V DC; ground-level APS segments power in heritage zones.
Track brake & sanders
Magnetic track brakes and sand improve stop distance on wet grooved rail.
V2X priority & AVL
Transit signal priority and stop annunciators sync with mixed-traffic streets.
Crash energy management
Front modules absorb impacts with cars and pedestrians at urban speeds.
On-board energy storage
Supercapacitors or batteries bridge dead overhead sections and enable partial off-wire ops.
Relative meters
Hotspots
Grooved rail wear
Flange gap widens causing wheel climb and derail risk at switches.
Trolley rope/pan wear
Head wire notching drops contact force in curves.
Point machine alignment
Switch throw failures strand trams mid-intersection.
Hub motor seals
Water ingress on low-floor motors causes bearing failures.
APS ground segments
Misaligned ground shoes arc and trip ground-fault protection.
Materials
Grooved girder rail
City rail profiles guide wheel flanges through tight street curves.
Cu contact wire
Overhead conductors sized for peak acceleration current.
Composite front cap
Energy-absorbing modules meet pedestrian impact standards.
MnCu alloy wheels
Resistant to shelling on frequent stop-start duty.
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