Slab

Slab
Track rails laid on a continuous concrete or asphalt base instead of conventional sleepers and ballast, to minimize settlement and changes in alignment, this helps to reduce maintenance costs.
Slack Action ...

For the flat slab at the top of a column, see .
An abacus (plurals abacuses or abaci), also called a counting frame, is a calculating tool for performing arithmetical processes, often constructed as a wooden frame with beads
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Other track forms include slab or non-ballasted track which does not require ballast. Ballast Train A generic term often used to refer to any sort of track engineer's train.

An abrasive disk in the motor tool made quick work of reducing the area of slab sliding on the pit rail by 75% or more. This helped a little but not enough. Why not opt for a shorter lever arm?

Scale Segmental Bridge Co offers box girder, slab girder, and T girder bridges. The box girders come in 3 sizes, 18', 20' and 28', and come with your choice of tubular steel, H column, or square pilings, and have short abutments.

The major car builders would cater to the railroads' whims and wants be incorporating all kinds of specialized features like slab sides instead of corrugation, polarized windows, special floor plans and window arrangements, ...

The other end shows the brickwork walls with concrete slab support. Round concrete "dot" is the Marx logo, rendered as if made in cement. Many companies did this on their buildings. The office door and all windowpanes are green.

See also: Standard, Point, Current, Switch, Train