This comment is more about the internal design of the loco. The design externally is obviously and correctly about the model being a true representation of the prototype. However, the interior does not appear to give any realistic thought to the dcc requirements. I have just attempted to convert my Hornby J15 to TXS. I chose this because it is one of my favourite and most reliable locos. It also has a tender for the chip. fitting the chip, speaker and power bank is a physical impossibility. I ended up removing the coal which has offered a suitable footprint but it protrudes above the tender sides. There is also an issue the the cable from the chip to the 8 pin plug. All this state of the art technology and we are expected to unceremoniously stuff the cables anywhere they may fit and screw down the lit before it springs open. Hoping that I have not damaged anything. Sorry if this sounds like a rant but I think that cleverer people than I can develop a better solution.