After being away from the hobby for 25 years things have changed.
There were well over 25-30 twin coil switch machines that only positioned the turnouts.
The question was how to adapt these to control LEDs for panel indicators and power frogs.
This led to the development of a sub base for the Twin Coil and two micro switches.
The switchs are operated by the movement of the center rod.
The 5 amp micro switches have normally closed and normally open contacts.
Now my panel board as well as the signals are lit by the LEDs.
Total cost $1.65 for the Twin Coil (25 years ago price) and $2.00 or less for surplus micro switchs.
Jerry
Speaking of old twin-coil machines, I still have some uninstalled KTM open frame monsters with built-in 3pdt contacts. Cost me less than $2.00 when I bought them 40 years ago.
Present-day Rix machines come with dpdt contacts, which meet my usual needs. The KTMs will be used when I need the extra circuit for interlocking or powering a reverse loop.
Chuck (Modeling Central Japan in September, 1964)
WHAT one DID is and what you PAID, is of little help to those that want to FOLLOW. Commonly used Atlas and Peco switch machines do not have electrical contacts to power Signal lights. WHAT TO DO?
ATLAS recommends adding a 2nd twin coil relay. Problem: Atlas twin coils today cost $7.50 each plus twin coils require 2-3 AMPS each - or 4-6 amps to throw a pair reliably. Only Top of line MRC’s provide enough power. (Most only provide 1.4amps -1.5 amps).
BEST answer is to replace Switch machines with ones with electrical contacts, such as RIX or TORTOISE. NJ International and some old KTM twin coils might still be around if you can find them. RIX’ are still available, and have DPDT contacts.
TORTOISE and ‘stall motor’ switch machines require constant power - hoever low - while twin coils use momentary high power to throw, and mechanical springs to hold - therefor are not compatible.
THIRD OPTION for the more talented, is to use push levers with micro switches - again, replacing the switch machine.