A model railway gauge of 64 mm, standardised in 1909 but since fallen into disuse.

(biblical) The second book of Corinthians and the eighth book in the New Testament of the Bible, an epistle to the people of Corinth attributed to Paul the Apostle and Timothy.

A book of the Catholic and Eastern Orthodox canon of the Old Testament, considered apocryphal by Protestants.

(biblical) The fourteenth book of the New Testament of the Bible, the second epistle to the Thessalonians.

(organic chemistry) The industrial solvent butanone.

Under the Whyte notation system, a steam locomotive that has two leading wheels, three sets of eight driving wheels, and a two trailing wheels.

(organic chemistry) The IUPAC name for methacrylic acid.

plural of 4-6-2+2-6-4

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-8-0 wheel configuration.

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-6-4 wheel configuration.