Kind of depends on which phone you have… some require particular format files.
On my phone, only sounds that come over the phone audio can be used for ringtones… other sounds, like alarms, etc., can be downloaded in several formats and work just fine… But not as a ringtone!.
I wanted a steam whistle sound but could not find one that sounded like a real steam whistle (lots of toy sounds, but no “real” ones). I also could not find any way to create the sound as though it was from the received audio to download it that way… so I dialed my cell phone from my house phone and played a sound I already had on my computer into the house phone mouthpiece… did the trick!
There’s a tool called ACA Audio Recorder that you can Google and download. Go to Youtube and find a video of a GP30 blowing its horn, record this sound with ACA. Then go to www.myxer.com where you can upload the file you saved from ACA. Edit the tone with the software onsite and then send a link to your phone, follow the link and download the tone.
If you have text messaging on your phone, email the sound clip to yourself, then save it as a ringtone.
Alternatively, my phone has the provision for an added memory card. I simply copied the desired sound clips from my computer to the card (using the appropriate adapter), then texted the file to myself and saved it as a ringtone.
Google train horns/whistles - there are plenty of samples out there. If you right click on the link you can usually “save as”. (From the legal department: consider copyrights.)
If you don’t know what the email address for your texting is, send a text to your regular email address. Odds are it’s your ten digit number plus “@” and some extension - I think most Verizon phones use “@vtext.com” for instance.
I’ve got both a steam whistle and a Diesel horn, as well as several sirens and some other sounds on my phone. And since I use different ring tones for different people, I often know who’s calling before I ever pick up my phone.
Many sound programs on computers already contain a recording feature, if you have a microphone for your computer. Between that and on-line searches, the sky is pretty much the limit.