From 1908, the British Great Western Railway GWR purchased several series of a steam locomotive type generally known as the Large Prairie (wheel arrangement 2-6-2T). The last series were the 4100-4179, built between 1934 and 1949. The three-coupled locomotives, which were equally fast forwards and backwards, were primarily used on suburban trains, but also proved their worth on light freight trains. The last of the 1039 hp, 75 mph two-cylinder superheated steam locomotives were retired by 1965, but ten examples remain, some of which were operational in the 2000s or still are today.
F14: engine driver dialogue selectable via CV168 value 0-4 (random/specific)
F27: rail clank (4 x different selectable via SV10 value 0 to 3)
F24: doors open/close selectable via CV167 value 0-1 (passenger door/cab door)
F23: automatic warning system selectable with CV169 value 0-1 (bell/buzzer)
| Key | Functions | Sound slots | Volume CVs | Volume values |
|---|
| F0 | front light | | | |
| F1 | sound on/off | 1, 2, 5, 28, 30, 32 | 259, 267, 291, 475, 491, 507 | 255, 255, 30, 20, 70, 10 |
| F2 | brake function | 25 | 451 | 100 |
| F3 | whistle high | 3 | 275 | 200 |
| F4 | coal shoveling | 5 | 291 | 30 |
| F5 | heavy load | | | |
| F6 | acceleration/brake time, shunting mode/shunting speed | | | |
| F7 | ejector sequence sound off | | | |
| F8 | whistle low | 6 | 299 | 200 |
| F9 | Drain Cocks | 9 | 323 | 60 |
| F10 | conductor's signal | 10 | 331 | 48 |
| F11 | coupling/buffering | 8 | 315 | 80 |
| F12 | light engine mode | 28 | 475 | 20 |
| F13 | injector | 20 | 411 | 40 |
| F14 | engine driver dialogue | 7 | 307 | 128 |
| F15 | ESU smoke generator | | | |
| F16 | safety valve | 12 | 347 | 230 |
| F17 | flange squeal | 15 | 371 | 40 |
| F18 | soundfader | | | |
| F19 | blower | 24 | 443 | 40 |
| F20 | short whistle | 4 | 283 | 140 |
| F21 | volume control | | | |
| F22 | water tank filling | 18 | 395 | 30 |
| F23 | automatic warning system (aws) | 22 | 427 | 40 |
| F24 | passenger doors open/close | 19 | 403 | 70 |
| F25 | railway detonators | 16 | 379 | 255 |
| F26 | disable brake squeal sound | | | |
| F27 | rail joints | 17 | 387 | 45 |
| F28 | AUX3 | | | |
| F29 | set/release handbrake | 14 | 363 | 128 |
| F30 | wheeltapper | 11 | 339 | 60 |
Make sure that index CV31 is set to 16 and index CV32 is set to 1 before changing a volume CV.