I didn't forget about it but don't see the need for it. "Normally" or here in the States when a train is approaching a crossing the Lights start flashing and a bell is dinging. After a few seconds the crossing gates start to lower. So what is the purpose of the amber LED?

The Amber light is required for this type of crossing in the UK. It provides warning of an approaching train BEFORE it crosses the grade.
In the US, Lights are required to provide at least 20 seconds warning time. Gates are not required and depend on the local requirements. But if used, the warning time has to be at least 25 seconds. Recovery time, in either case, is 5 seconds in the US.

Now that I mentioned it why not include the ding ding ding sound and crossing gate mechanism.

If the TS requests it...sure.

 

Yes please, if possible uk style warble would be the desired option. Cheers

 

Yes please, if possible uk style warble would be the desired option. Cheers

The 555 timers will not operate safely at 16v, so a voltage regulator will be needed to drop the supply voltage to a safe level.
Also, please speciify the model of LED(s) and warble (bell(s)) to be used so that output drive capacity can be determined.

 

For the warning alarm you could use a sound module similar to the one in the photo. It has a built-in mic for recording.
I recorded the alarm tone from a YouTube video using my phone speaker.
I'll upload the sound byte if I can configure out the file format.

.DFROBOT SEN0197

 

This is the kind of thing an Arduino is good for. The possibilities are endless for these kinds of projects and learning the code to do what you want wouldn't take very long, in fact it could be done with a few lines of code and with a high degree of accuracy due to the crystal oscillator. I bought a few for 6$ and they work great. Good luck.

 

This is the kind of thing an Arduino is good for. The possibilities are endless for these kinds of projects and learning the code to do what you want wouldn't take very long, in fact it could be done with a few lines of code and with a high degree of accuracy due to the crystal oscillator. I bought a few for 6$ and they work great. Good luck.

Hi thanks for the advice, I've sourced an Arduino, now currently looking to see if i can get it to flash two red lights and make the typical UK warble sound .
cheers.