This the routine to preparing a Roundhouse G-scale gas operated loco for operation:
Fill the boiler with the correct amount of water. This is done through the removable safety valve (1) on the boiler and a syringe is supplied to make the task easy. Fill the gas tank (2) with butane gas.
Light the burner (3) by holding a flame over the chimney while slowly opening the gas regulator (4). Regular lubrication of all working parts is important and should be carried out before each operating session.
Lubricate the loco while you wait for the steam pressure to rise. A device called a displacement llubricator (5) passes a special type of oil to the internal workings of the cylinders and is filled up before a run. Remove the knurled cap from the top and slacken the drain screw (6) two or three turns but do not remove it. Any water in the lubricator will run out through the drain screw. Tighten the drain and refill with steam oil. All the external moving parts need a squirt round with conventional 20-50 motor oil from an oil can.
After five or six minutes working pressure (Preassure Gauge (7))is reached and you are ready to go so put the loco into gear (move the reversing lever for either forward or reverse) and open the regulator (8).
The steam is driving the loco.
The loco will run for around 30 minutes on one boiler filling and during that time, you have full control over starting, stopping, speed, direction and steam production. At the end of a run, after the gas tank is empty, the process can be repeated.