Off to one side was a pair of large pressure cylinders.

Unlike the other locomotives, both high and low pressure cylinders had the same piston stroke.

Picard held a small pressure cylinder from Beverly's medical kit.

It had a 48in stroke, and its High pressure cylinder was 18 " in diameter.

The transportation of high pressure cylinders is regulated by many governments throughout the world.

No," Poy admitted, "but most pressure cylinders are much the same.

The low pressure cylinder was said to be larger and heavier than any other fitted to a paddle steamer.

Usually the low pressure cylinder was on the bottom, but clearance issues sometimes caused it to be put on the top.

Without this, the low pressure cylinders would have to actually work against atmospheric pressure.

Their spent steam is then fed to the larger low pressure cylinders that drive the front set of coupled wheels.