Between 1963 and 1992 Polish manufacturer Fablok built 1822 samples of hood style diesel electric freight loco SM 42. Additional 268 units (SP42) were ordered with steam heating boiler for passenger train service. The eight cylinder prime mover develops 800 HP and enables the loco to reach a maximum speed of 90 km/h.
Different starting processes can be selected with F1: 1x press button = warm start / press button 2x = false start / press button 3x = cold start
F5 enables the heavy load mode: The diesel notch is always one up compared with normal operation. If you want to jump two notches, simply set CV 104 to 170 (instead of 150).
F27 turns on the manual ntoching. Once F28 is on, you can use F28 to notch up and F29 to notch down. F27, F28, and F29 must be turned off to return to normal mode. If F27 is off and you press F28, the prime mover will run to full speed.
F17 will bring the locomotive to full stop.
| Key | Functions | Sound slots | Volume CVs | Volume values |
|---|
| F0 | front light | | | |
| F1 | sound on/off | 1, 22 | 259, 427 | 120, 45 |
| F2 | air horn (high) | 3 | 275 | 220 |
| F3 | air horn (low) | 4 | 283 | 255 |
| F4 | radiator fan | 5 | 291 | 90 |
| F5 | heavy load | 32 | 507 | 110 |
| F6 | acceleration/brake time, shunting mode/shunting speed | 29 | 483 | 255 |
| F7 | curve squeal | 15 | 371 | 115 |
| F8 | AUX#1 | | | |
| F9 | compressed air let off | 9 | 323 | 100 |
| F10 | conductor's signal | 10 | 331 | 120 |
| F11 | coupler clank | 8 | 315 | 90 |
| F12 | coasting | | | |
| F13 | apply locomotive brake/locomotive brake release (automaticly) | 13 | 355 | 100 |
| F14 | announcement #1 | 7 | 307 | 255 |
| F15 | esu smoke generator | | | |
| F16 | open/close cab door | 12 | 347 | 85 |
| F17 | brake function 1 | 25 | 451 | 125 |
| F18 | announcement #2 | 14 | 363 | 255 |
| F19 | apply/release hand brake | 21 | 419 | 70 |
| F20 | double horn signal | 3, 4 | 275, 283 | 220, 255 |
| F21 | switch flange | 18 | 395 | 80 |
| F22 | rail clank | 17 | 387 | 95 |
| F23 | release/set train brake | 16 | 379 | 108 |
| F24 | compressor | 6 | 299 | 115 |
| F25 | sanding valve | 11 | 339 | 65 |
| F26 | sound fader | | | |
| F27 | manual notching logic on/off | 27 | 467 | 0 |
| F28 | manual notching up | | | |
| F29 | manual notching down | | | |
| F30 | disable brake squeal sound | | | |
Make sure that index CV31 is set to 16 and index CV32 is set to 1 before changing a volume CV.