After posting on a recent thread regarding updating Triang/Hornby Mk1 coaches lighting-wise, I was PM'd by a recently joined member asking why he couldn't find my referred to "How-to" about the circuit and general setup, so as it appears this info may have been lost in the forum changeover to Xenforo, I thought it might be helpful for any other of our newer members, to post it up again for reference. At this point, I must state that this is just the circuit and method I use, and several other ways of doing this, including a fairly pricey ESU kit for carriage lighting (Circa £18!!) are available. If you have a fair number of coaches/guards vans etc to light, then by buying the components in bulk and making up the circuit boards yourself, it's easily possible to build the circuit boards yourself for less than 50p a board, so you can light a lot of coaches for the price of one ESU kit. That said, here's the relevant circuit. As can be seen, my 'standard-fit' board is quite small at 27x16mm, but it's equally possible to make it smaller still if you wish, as the 4 diodes and resistor could be vertically mounted rather than flat to the board, so fitment in "N" gauge is feasible. At 71, my eyesight is not good enough to go smaller, so this'll do for me! Keith.