- Narrow gauge: Railroad track where the rails are spaced less than 1,435 mm (4 ft 8 1⁄2 in) apart. There are many common gauges narrower than standard, amongst them 3 ft 6 in (1,067 mm) widely in Africa and Asia; 3 ft (914 mm), which was the most common narrow gauge in the U.S.; 2 ft 6 in (762 mm), used in various locations across Europe, Asia and elsewhwere, South America and Australia, and 2 ft (610 mm), which saw widespread use in the UK. Meter gauge 1,000 mm (3 ft 3 3⁄8 in) is also widely used in Asia and Africa. Narrow-gauge lines are often found in mountainous terrain where the cost savings of building a smaller railroad can be considerable. (Historically, the term "narrow gauge" was once used in Britain for what is now called standard gauge, as the only other gauge then in common use was the Great Western Railway's 7 ft 0 1⁄4 in (2,140 mm) broad gauge.)
- Northern: A steam locomotive with a 4-8-4 wheel arrangement. Also known variously in North America as "Pocono", "Niagara", "Confederation", "Greenbrier", "Potomac" et al. (see Whyte notation).
- Notch 8: The 8th Notch of the throttle control, indicating Full Power.
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