>> I need to have a standard coupler.
>
> Kadee
#802 (or the rust-colored equivalent) is the most popular.
Since I
cut off the glad hands and uncouple manually, I've also bought the On3
Kadee #803 couplers when I've come across a good deal at train shows.
You're more likely to see them at a discount than the S scale variation.
Other than a slightly different trip pin, they are the same
coupler.
>> Locomotives headlights <snip> solve
the problem of detachment. Ideas?
> The wires can be routed via a
Miniatronics 2-pin connector
For something that's not going see a
lot of use, you can make a cheap and basic connector using a piece of
brass wire inserted into a bit of brass tubing. I've done that inside a
number of locomotives.
Stan Stokrocki