trolleybus
C1Neutral, slightly technical
Definition
Meaning
An electric bus powered by overhead wires via two trolley poles.
A public transport vehicle that combines the rubber tires and flexibility of a bus with the electric propulsion and overhead wires of a tram.
Linguistics
Semantic Notes
The term is a closed compound. It specifically denotes a vehicle that is not rail-bound, distinguishing it from a tram/streetcar.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'trolleybus' (UK, one word) is common, though 'trolley bus' (two words) is also seen. In the US, 'trolley bus' is more typical. The vehicle is less common in the US, where 'electric bus' is often used generically.
Connotations
In the UK, it is a standard, if somewhat dated, term for a specific public transport mode. In the US, it may evoke older systems or be confused with 'trolley' (streetcar).
Frequency
More frequent in UK/Commonwealth English due to greater historical and current use. Rare in modern US English outside historical or technical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The trolleybus runs [from X] [to Y] [along Z].The city is expanding its trolleybus network.The trolleybus is powered by electricity.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Off his/her trolley (slang, meaning crazy/unhinged; note: this idiom derives from 'trolley' as in cart, not trolleybus, but is a common confusion).”
Usage
Context Usage
Business
The city council's tender for new zero-emission vehicles included a clause for twelve articulated trolleybuses.
Academic
The mid-20th century saw a peak in trolleybus adoption in European cities as a compromise between tram infrastructure and bus flexibility.
Everyday
I take the number 12 trolleybus to work because it's quieter than the diesel ones.
Technical
The new trolleybus model features onboard batteries for off-wire operation of up to five kilometres.
Examples
By Part of Speech
verb
British English
- The route is being trolleybused while the roadworks continue. (rare, informal)
adjective
British English
- The trolleybus network in the city is extensive.
- We studied the city's trolleybus history.
American English
- The trolley bus system was decommissioned in the 1960s.
Examples
By CEFR Level
- The blue trolleybus goes to the city centre.
- In many European cities, you can travel cheaply by trolleybus.
- The council debated whether to replace the ageing trolleybus fleet with battery-electric buses.
- Advocates argue that a modern trolleybus system, with its dedicated overhead infrastructure, offers a more reliable and sustainable solution than relying solely on battery technology.
Learning
Memory Aids
Mnemonic
Think: TROLLEY + BUS. A bus that gets its power from a trolley (pole) on wires, like a shopping trolley is guided by rails.
Conceptual Metaphor
A HYBRID/CROSSBREED (between a tram and a bus).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate directly as 'троллейбус' without context, as the Russian term is a direct cognate and refers to the exact same vehicle. The trap is assuming it's a false friend—it is not.
Common Mistakes
- Confusing it with a 'tram' or 'streetcar' (which runs on rails).
- Misspelling as 'trollybus'.
- Using 'trolley' alone to mean trolleybus, which in the US usually means a streetcar.
Practice
Quiz
What is the primary distinguishing feature of a trolleybus compared to a standard bus?
FAQ
Frequently Asked Questions
No. A tram (or streetcar) runs on metal rails embedded in the road. A trolleybus has rubber tyres and is not rail-bound, giving it more flexibility.
Most US systems were dismantled mid-20th century in favour of diesel buses. The term 'trolley' in the US is more commonly associated with rail-based streetcars.
Traditional models cannot. However, many modern 'trolleybuses' are equipped with auxiliary battery or supercapacitor systems that allow for limited off-wire movement.
They are quiet, produce no local exhaust emissions, have high torque for hilly routes, and can be powered by renewable electricity. They also typically have a longer operational lifespan than diesel buses.