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A pulse method to change the state from on to off or vice versa.
http://www.heathcote-electronics.co.uk/RelayBrd.htm
http://www.4qdtec.com/trd.html

This is a change in the content of solder. Lead free solder is generally recommended due to Health and Safety considerations, but 60:40 tin:lead is preferred for electronic kits and is still available from suppliers such as Rapid Electronics.

Light Emitting Diodes (LEDs) emit light when an electric current passes through them
\\Circuit symbol:

http://www.merg.org.uk/merg_resources/led.php
http://www.kpsec.freeuk.com/components/led.htm

A German dcc system and decoder manufacturer

A DCC decoder made especially for lights for a loco or carriages.

In a model railway it is a way to do step by step sequence to make the train do what you require.
Logic