| skos:altLabel | - headroom
- tunnels
- size
- small
- structure
- width
- infrastructure
- accommodate
- clearance
- dimensions
- obstructions
- clearances
- Clearance
- low clearance
- tighter
- height restrictions
- Structure gauge ยง Accidents
- Structure gauge#Accidents
- Tunnel and station platform clearances
- Tunnel clearances
- bridge clearance
- bridge strikes
- bridge structure
- bridges and tunnel clearances
- clearance outline
- design clearances
- gauge clearance
- headway
- height clearance
- inadequate clearances
- infrastructure clearance envelope
- infrastructure dimensions
- limited clearances
- low-profile
- minimum clearance
- minimum structure gauge
- overhead clearance
- restricted clearance
- structure gauge
- sufficient height
- tight clearances
- too small
- tunnel clearance
- tunnel clearances
- tunnel's dimensions
- vertical clearance
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