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2-8-8-4

noun

Under the Whyte notation system, a Mallet-type locomotive with two leading wheels on a leading truck, two sets of eight driving wheels, and four trailing wheels on a trailing truck.

Under the Whyte notation system, a 2-8-8-4 refers to a steam locomotive with two leading wheels, eight driving wheels, eight trailing wheels, and four additional wheels for support.

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4-8-8-2

noun

Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of eight driving wheels, and two trailing wheels on a trailing truck.

The 4-8-8-2 locomotive was a powerful steam engine.

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2-8-8-0

noun

Under the Whyte notation system, a 2-8-8-0 refers to a steam locomotive with two leading wheels, eight driving wheels, eight more driving wheels, and no trailing wheels.

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1-2-3 block

noun

A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 1, 2, and 3 inches long, respectively. May contain arranged holes. Similar, larger blocks are called 2-4-6 blocks.

I used a 1-2-3 block to measure the dimensions of the metal part.

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2-4-6 block

noun

A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 2, 4, and 6 inches long, respectively. 2-4-6 blocks are a larger version of the more common 1-2-3 block.