13/10/2019.

DCC lighting of the train

There are two possible approaches.

The first solution is better for those who are not too comfortable with electrical wiring. Personally, I chose the second one. That said, the circuits I propose are valid in both cases, with the reservations mentioned above.

Equipment of the driving coaches

Front and rear lamp lighting

The lamp lighting is done by two incandescent lamps through light guides with multiple reflections. Not surprising that you hardly see anything at the exit.

Two options are possible to improve this:

I chose the second option, much simpler, first with 4.7 kΩ resistors, but the brightness was very insufficient. With 1 kΩ resistors, it is correct.

For the real driving coach, these resistors are CMS soldered directly on the tracks of the previously cut circuit (circle). A trick to get rid of track pieces to remove: after cutting the tracks in two places to about 2 mm away, apply the hot soldering iron on the part to be removed; after a few seconds, it will come off very easily.

Note the connection of the wires to feed the rest of the train on the decoder connection pins.

PCB seen from above

Hover over the picture to zoom.

The light of the cold white LED that I used should be warmed up according to my usual method (orange screen cut out of a translucent binder cover, glued or taped into the opening). On the other hand, the central light lights up much more than those below; to mitigate this, simply tilt the LED down.

Regarding the red LED, it must be installed perpendicular to the circuit, from below, through the already existing hole, drilled to Ø 3 (arrow), so that the luminous flux is oriented to the right direction. I put electricians tape in the slot under the LED to avoid any contact with the chassis.

PCB seen from below

Hover over the picture to zoom.

A small drawing may better explain.

Drawing of the PCB

In the dummy

The goal is the same. Here, to power the LEDs, I simply replaced the original diodes with conventional resistors. Don’t forget to cut off the track between the white — yes, rather grey —, and yellow wires (arrow).

Circuit board in the dummy

Lighting of compartments

Honestly, this lighting is not essential, because you really don’t see much. As the plastic room has a “roof”, the light can only pass on the sides. Also, I planned indirect lighting with a silver reflector stuck under the roof.

Driving coach

Overview, roof removed. Note the reflector (foil blanket).

Overview of the driving coach

Hover over the picture to zoom.

View of the motor coach lighting

The light strip is fixed in two points: on the right by the chassis fixing screw; on the left by a new screw taking advantage of an existing tapping.

Dummy

Here is a view of the light strip.

View of the dummy lighting

Note in passing the presence of a power reserve circuit, mounted on Veroboard, which supports the lighting of all coaches; this is why its capacitor is of relatively large value (1000 μF), which made it impossible to implant in the real driving coach:

Power reserve circuit in the dummy

This circuit is fixed using a single Parker screw screwed into the body, with the interposition of a spacer. The circuit, which would be visible through the fan grilles, will be covered with black paper.

Power reserve circuit in the dummy

Note the presence of two well German looking drivers, Roco origin too, planted on a 3 mm thick piece of extruded polystyrene, painted Humbrol grey acrylic. They are also present in the motor coach, although not yet installed when taking pictures of it.

Crew in the dummy