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Transportation Research Thesaurus

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Each term in the TRT is assigned a unique notational code that conveys its location within the hierarchy. The first letter of the notation represents the facet or top term. Using the notational code it is easy to determine the terms relation in the hierarchy. The term's parent (Ae) will have one less letter (from the right end) as the term (Aea). Siblings (Aeg, Aes) will have the same notational code as the term except the last letter will be different. Children (Aeac, Aeah) will have one letter appended to the end of the notational code of the term.

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Top Terms> Facilities > Transportation, hydraulic and utility facilities > Railroad facilities > Railroad tracks > Types of track > Narrow gage track

Pmudb: Types of track
Pmudbn: Narrow gage track

Find documents having Narrow gage track

Broader Term:
Pmudb: Types of track
 
Related Terms:
Pmudbb: Ballastless track
Pmudbc: Curved track
Pmudbe: Concrete slab track
Pmudbf: Double track
Pmudbg: Guideways
Pmudbh: High speed track
Pmudbj: Jointed track
Pmudbm: Multiple track
Pmudbs: Single track
Pmudbt: Tangent track
Pmudbv: Track panels
Pmudbx: Unconventional track
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