Installing A Decoder To A Hornby Class 09 Locomotive

The shunting locomotive used on the Inglenook South puzzle is a Hornby class 09 diesel electric locomotive. This example is catalogue number R2801, locomotive number 09019 in Mainline blue livery. A Hornby eight pin decoder was fitted, remembering always to refer to the manufacturer instructions for electrical modifications.


The locomotive was turned upside down and the body was detached from the chassis by removing four screws.


This particular example of class 09 locomotive was fitted with Southern Region platform level brake pipes, these must be carefully detached from the chassis at the front and rear of the locomotive.


Another pipe on the side of the locomotive body needs to be moved away from the chassis to avoid damage to this component.


Towards the cab end of the locomotive is where the DCC socket is located, seen here fitted with a blanking plate which needs to be lifted up and out. The 1|> symbol is very important as it shows where pin number 1 is located for installation of the decoder.


As the blanking plate is removed, you can see how pin number 1, shown by the symbol 1|> is orientated.


Now the decoder can be introduced and installed in the eight pin socket, observing that a very tiny number 1 is printed on the circuit board to help orient the decoder the correct way around. The orange wire (normally pin 1) also helps identify the same.


The decoder is now pushed home into the circuit board, with both number 1 symbols matching in the correct corner of the socket.


Space is restricted in a locomotive such as the class 09, however some was available towards the end of the locomotive chassis, where the decoder circuit is held in position with some sticky pads. This location appears to be a few millimetres clear of any body shell plastic so any heat created by the circuit boards shouldn’t impact on the body shell structure.


The body is then reunited with the locomotive chassis, with any body shell pipes refitted and chassis screws returned then tightened, before testing on the track.


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