The plow-locomotives to be 6 to 10 nominal horse power, but are
designed so that they effectively make the three to four times that force. The boilers are built as light as possible, regardless of their safety, a working steam pressure to 12 atmospheres. Each drum has a steel-wire rope length of 450 yards. The operation speed of the gear for the plow in these smaller cable plow - locomotives is set up so that the full force is transferred to the plow and the heaviest ground unit can be managed.