I currently have a project in mind. I'm wondering how to do it, or if it's even possible.
On the (UK) rail network one method of passing a train between signal boxes is the Train Describer. This was until recently an electro-mechanical device that you would enter the four digit code into, ex would be "1R27" into a keypad, and press the send button. This would transmit the code to the receiving machine and it would flash up on the display. An acknowledge button would be pressed which would confirm the receipt of the code and clear the transmitting machine to send another once the train has passed a certain point.
I'm considering an electronic version using an Arduino, a keyboard, and a couple of LCD displays. Trouble is, is it possible, and where the hell do I start lol. Up until recently I was a TTL and Relay kinda guy.