They are also used for transporting diesel powered equipment such as track tamping machines through tunnel sections.
Attention focused on the costs and benefits of tamping the ballast over the sleeper ends.
This is, in the mechanized age, usually done by a ballast tamping machine.
This has the advantage of not disturbing the well-compacted ballast on the trackbed, as tamping is likely to do.
The tamping bank behind the lining bogie has a vibrating motor and four arms for each rail.
The amount of vapor pressure that builds up, and the temperature reached, are dependent on the grind and packing (tamping) of the grounds.
The filling was usually left high, with final condensation -- tamping down -- occurring while the patient chewed food.
Other work involved looking at the tamping of ballast, properties of subsoils, and rail prestressing.
