1st of all I wanna thank you for taking your time to read this post. I know there are many other busy important things that you may have, So once again I want to thank you for giving this thread your attention. All of them using LED's as output.

5 outputs
1) Area 1
2) Area 2
3) Area 3
4) Flashing Light
5) Warning Bell

http://imageshack.us
Area 1 & Area 3
Flashing Light and Warning Bell Will be turned on when trains enter from either side.
Flashing light will flash for 3 seconds.
Waring bell will turn on for 5 seconds.
Area 1 or Area 3 lights up depending on wher the train is.

Area 2.
Area 2 light on.

No Train
All outputs are off.

Tips
Use counters to keep track of time for flashing light and warning bell.


Haha I still don't understand. Is there any reading material on where to begin?

 

How are you sensing the train?

Are you using a microswitch, or hall effect sensor? Even a light-beam-break sensor?

After you get the input from the switch, you can signal the flasher / alarm circuit.

Break down the problem.

Get yourself a circuit that will flash your LEDs for 3 seconds and your audio alarm for 5 seconds.

Once done, use your triggering switch to activate it.

 

I'll be using normal switches to represent the sensors. The problem is How do I design my circuit so that when 1 switch is on, the flashing light and warning bell will flash 3 sec and 5 sec respectively?

 

Just start the two timers by the switch and let them do their job.