Rapido Trains Amtrak NPCU F40PH Operator's Manual page 12

CV48 initial value:
0 = E-Bell (default)
64 = Air Bell
CV48 horn options and values:
0 = Nathan Old Cast P5a
1 = Nathan New Cast P5a
2 = Nathan M5
3 = Nathan K5LA
4 = Nathan Old Cast P5a (Alternate)
The default is the E-Bell and the Nathan Amtrak K5LA #4. Add the two values above (0
for the E-Bell and 8 for the K5LA #4) and you have a default value of 8 for CV48.
Say you want to keep the E-Bell but you want a New Cast P5a. Add 0 for the E-Bell and
1 for the New Cast P5a and you get a value of 1 for CV48.
If you want the Air Bell and the Nathan Amtrak K5LA #2, add 64 for the Air Bell and 6
for the K5LA, and you get a value of 70 for CV48. Hopefully you get it now. If you are
following everything precisely and you can't seem to change the settings, read the note
below which we should have told you before.
IMPORTANT: You need to change CV48 using a programming track or a
LokProgrammer. (Sorry. We keep saying we'll remember to include that
important bit of information at the top of Bell and Horn section of the
manual instead of at the bottom, but we keep forgetting.)
F3 Doppler Horn
You can play this when approaching level crossings at speed. It is a real recording of an
Amtrak F40PH (with train) approaching a level crossing at high speed with the engineer
playing music on a K5LA. We think this sounds so beautiful, it makes us cry. It's the same
horn as on the NPCUs, so there's no worry about it not sounding right. If you've also
got your ditch lights turned on (F6) and press F3, they'll start flashing alternatively. You
know, just in case nobody hears you barrelling towards the crossing.
F4 and F5 – Standby and Run
See Prototypical Operation – DCC (Sound) on page 9 above.
F6 Ditch Lights
The ditch lights should be turned on whenever your NPCU is pulling leading a train.
However, remember to turn them off when approaching a station or an oncoming train
as they are BLINDING.
But wait, there's more! Should your ditch lights be on when you sound the horn using
F2 or F3, your ditch lights will flash alternatively. That's right folks, flashing ditch lights!
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5 = Nathan New Cast P5a (Alternate)
6 = Nathan Amtrak K5LA #2
7 = Nathan Amtrak K5LA #3
8 = Nathan Amtrak K5LA #4 (Default)