
GP38/SD40 Locomotive Operating Manual
9
Weather conditioned driving physics
In dry weather the adhesion between wheel and rail is good, the locomotive can develop full tractive
effort. On start-up’s, nevertheless you shouldn’t engage the top throttle notch immediately
(according to the weight in tow), to avoid wheel slip.
In humid weather and rain the locomotive inclines a lot rather to wheel slipping, with snow and ice
the adhesion gets worse even more. You have to handle the throttle very carefully on start-up and
make use of sand, when required. Do not forget, to switch off sanding if not more needed, otherwise
you will soon finish with empty sand boxes.
Sanding
Use sand when the wheels are slipping. There are 2 sand
switches. They are now fully functional and have different
effects. The short one "SANDING LEAD TRUCK" has a switch
function and causes normal, continuous sanding. (The
same function as KP- on the keyboard). The traction boost
when wheel slip occurs is 40%. The longer sand wobble
lever "SAND" has a spring function (button) and causes a
traction boost off 80%, sanding all trucks. When pressed
down, the sand consumption rate will double. It is handy
on heavy start up's.
Diesel fuel and sand consumption
The locomotive consumes diesel fuel, depending on the throttle
position. When idling a lower fuel amount is consumed. Also
consumes sand when sanding. If the fuel level falls under 10%, a
warning message is given. With empty tank the locomotive develops
no more tractive effort and shuts down. It has eventually to be
towed off to the next filling facility by a helper loco. With empty
sand box sanding shows no effect. The loco can be refilled in a
suitable tank and sand facility (if available on the route). You can
check any time the still remaining fuel and sand amount, pressing
the CTRL key and clicking with the right mouse button on the
locomotive, and selecting "View Details" (in the driver's module).
Fig. 8 View Details Window
Fig. 7 Sand switches and lights
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