I have had a couple of enquiries about the fitting of a DCC chip in the Fowler. The instruction sheet should make this clear, in particular how to remove the superstructure and chassis keeper plate. However, there is very little space in the locomotive. The sectioned diagramme attached to this post shows the most suitable locations for a decoder. Fortunately, the locmotive draws very little current, even less than the Hudswell Clarke, and so does not require a big high power decoder.
Paul Martin of EDM models/NG Trains has been working with Paul Chetter, the well-known DCC expert, to produce an exclusive DCC sound solution based on the recordings of a preserved Fowler diesel using Zimo equipment. More information is available directly from them.