roll and chock assembly
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Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations … Wikipedia
pack — Synonyms and related words: a mass of, a world of, abound with, accumulation, ace, adulterate, age group, amassment, amount, army, assemblage, assembly, backing, backpack, bag, baggage, bale, band, bar, barrel, barricade, basket, batch, battalion … Moby Thesaurus