The Heisler locomotive was the last variant of the three major types of geared steam locomotives. Charles L. Heisler received a patent for the design in 1892, following the construction of a prototype in 1891. Somewhat similar to a Climax locomotive, Heisler's design featured two cylinders canted inwards at a 45-degree angle to form a 'V-twin' arrangement. Power then went to a longitudinal drive shaft in the center of the frame that drove the outboard axle on each powered truck through bevel gears in an enclosed gearcase riding on the axle between the truck frames. The inboard axle on each truck was then driven from the outboard one by external side (connecting) rods.
In 1897, Heisler received a patent on a three-truck locomotive. As with Class C Shay locomotives, the tender rode on the third truck. Unlike the Shay, Heisler's design did not have a continuous string of line shafting running the length of the engine. Instead, the tender truck was driven by a line shaft above the shaft driving the main engine trucks, connected to it through spur gears. This patent also covered use of a 4-cylinder 'vee four' cylinder configuration.
The Heisler was the fastest of the geared steam locomotive designs, and yet was still claimed by its manufacturer to have the same low-speed hauling ability.
Whistles:
CV163=0 SP 4449 Daylight
CV163=1 DRG&W 5 Chime
CV163=2 SOO Line 1003 - Default
CV163=3 DL&W 5 Chime
CV163=4 WM 6 Chime
CV163=5 Heisler
Bells:
CV164=0 Pnuematic Bell 1
CV164=1 Pnuematic Bell 2
CV164=2 Pnuematic Bell 3
CV164=3 Steam Loco Rope Pull Bell
CV164=4 SOO Line 1003 Bell - Default
CV164=5 DRG&W K27 Bell
CV164=6 Heisler
Air Pumps
CV166=0 Cross Compound #1 Heisler
CV166=1 Cross Compound #2 K27 463
CV166=2 Single Stage #1 Z27
CV166=3 Single Stage #2 T16.1
The ESU Full Throttle Steam files now include a few new logic features for added operational realism while still leaving you in control of HOW YOU wish to run your locomotive.
Heavy Load: F9 by default.
Similar to the “Drive Hold” button on the Full Throttle Diesel files “Heavy Load” allows you to adjust the “Steam Cut Off Valve” at any speed allowing for a fierce full chuff or drifting with snifters and rod clanks. Heavy load can also act as an offset allowing speed adjustments when engaged if desired.
Coast: F4 by default.
Opposite of “Heavy Load” Coast allows for a negative offset allow drifting sounds of Rods and snifter valves at any speed. You again have the option to hold the speed to adjust the speed with this offset active. Even allowing for an increase of speed with no chuffs as if drifting downhill.
Independent brake: F10 by default
Identical to the Full Throttle Diesel files. This allows for the locomotive to stop more quickly than its regular momentum would normally carry it. This one is pretty self-explanatory – just press the brake and come to a stop! For additional options there are 3 Braking rates that can be set up for user preference.
Articulation: Sound Slot 2
By adding Sound Slot 2 to the F8 Function Mapping and enabling the "Secondary Trigger" (CV250) you can add a second set of drivers making any ESU Steam File articulated.
Function Mappable Air Horn: F21 by default
Sound Slot 21.
Many Steam locomotives had a single chime airhorn equipped. Those modelling SP, MILW, and others can now have this feature and put it where they would like in the function mapping in addition to the whistle.
S0787 - Release Notes
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V-3 R-3:
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- updated independent brake
- updated boiler hiss
- updated steam chuff sound slot
V-4 R-4:
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- changed whistle sound slot 3 maximum sound slot speed to 128